You can solve 3 equations having 3 variables. Here are the 3 equation examples: x+2y+z=10. 2x-y+3z=-5. 2x-3y-5z=27. The goal is to reduce to 2 equations having 2 variables. Multiply bottom equation by (-1). Rewrite 2nd and 3rd equation. 2x-y+3z=-5. Add -2x+3y+5z+-27. Equals 2y+8z=-32. Go back to original equations and multiply by (-2). Then you have -2x -4-2z=-20. plus 2x -y +3z. When you add these 2 equations, the answer is -5y +z = -25. You have now reduced the equations from 3 equations do...
This is a very interesting educational video on how to find the factor trinomials using the swing method. Let us take an example and find the factor trinomials for 2xsquare-13x-45. Let us use the swing method. So now we will get 2xsquare -13x-45. You have to find the suitable factors of 90. It is 18 and 5. If you multiply 18 by 5 you will get 90. You will get (x-18over2)(x+5over2). The final answer is (x-9)(2x+5). Now we have found out the factor trinomials of 2xsquare-13x-45. This swing meth...
In this video the instructor shows how to simplify radicals. A radical is nothing but another name for a square root. To find the square root of a simple number the first thing that you need to do is factor it. If you need to compute the square root of a number, you first need to find a number which multiplied by itself gives the original number under the root. For example, to find the square root of 9, you need to find a number which multiplied by itself gives 9. Here the answer is 3. When 3...
Do you understand organic molecules or oxidization in chemistry? If you answered no then this is the video you need to watch. This video will show you grade 12 chemistry, with organic models, and will teach you about oxidization. In less than 4 minutes you will have a much better understanding of the topic. This is demonstrated with a few common chemicals which include potassium dichromate and ascorbic acid. Ascorbic acid or vitamin C is found in many foods that we eat including fruits and ve...
In this video the instructor teaches how to add and subtract integers. When adding or subtracting two numbers there can be four kind of situations depending on the signs between the numbers. When you are adding two numbers which are both positive then you move forward on the number line adding the two numbers together to give the result. Similarly when adding two negative numbers together then you move left side of the number line. Go to the left by the value of first number and go further le...
This is a very interesting instructional video on how to fill a cone. Pour oil into a cone of diameter 30 inches and depth 40 inches. Now find the volume of the oil as a function of its depth. Volume = 1 over 3 phi rsquare h. We don't know the height and depth of the oil poured into the cube. Draw similar right angled triangles. In one right angled triangle the height is 40 inches and in the other triangle it is h. Similarly the height is 40 inches and h respectively. Now rover h =15 over 40....
This video goes through the step by step process of doing long division with remainders. Multiple examples are used throughout the video to give the viewer a better idea of how to properly complete the difficult task. Perfect for anyone learning long division for the first time, or for anyone attempting to relearn long division after forgetting how to do the process (an all to common occurrence in a world with calculators on every cell phone).
An educational video by http://JustMathTutoring.com that shows how to use implicit differentiation to find a 2nd derivative of an equation.
Suck with Minesweeper? Always losing? Frustrated? If you answered yes to any of these questions then you need to watch “How to play Minesweeper - It's not all about luck!” by watchmytutorial. In this tutorial, you will learn some strategies to help you beat Minesweeper and you will hear a few helpful tips. Many people do not know, to mark a mine, you right click. The Windows game Minesweeper is a strategy game only for the Windows platform. If you want to start beating Minesweeper easily then...
Dan and Jennifer offer dating and relationship advice. Dan and Jennifer are answering a question from a young lady who wants to be in a relationship with a guy who is still hung up on his ex-boyfriend. Dan offers the advice of moving on, because the guy is not ready for a relationship. Jennifer describes this a love triangle with one person stuck in the middle. They both advise that the eventual outcome will be one of the women in his life will finally move on. The question is whether the wom...
This video discusses the number zero in division. When dividing numbers, there are ways to check your math, like multiplying the two numbers. When you multiply zero with any other number, it still is zero. The video goes on to discuss indeterminate answers. If you were to divide a zero by a zero, your calculator would come up with an error message. But there are real results to these odd equations and they are indeterminate. The indeterminate doesn’t really show up in everyday living, but in ...
This video discusses how to mend a broken heart after being dumped by a significant other. The video starts with a question being asked a guy who was just dumped and now his best friend is trying to go out with her. The presenter takes a satirical stance on the question and basically says time heals all pain. The presenter then says that is why they waited four months to answer his question, in the hopes that his broken heart would be healed. Finally, the video offers the advice of moving on ...
In this video the instructor shows how to factor a trinomial with negative leading coefficient. Most of the students are confused when they have to factor a trinomial with a negative leading coefficient. But there are many ways to solve these kind of problems as shown in this video. One way you can do is that take out the greatest common factor (GCF) of -1 from the equation. So pulling the -1 gives you the original trinomial with all the signs of the terms changed. Now go on and factor the ne...
In this video, Dan and Jennifer answer a 71 year old woman's question about her relationship. The asker has been staying with an 80 year old man that she met online, for three years. Throughout the duration of the relationship, the man has not told his family (which comprises of his two children) about the relationship. The woman is unsure about what exactly this means. In addition, the man has been over to the woman's house multiple times, but she has never been to his house. Dan and Jennife...
Dan and Jennifer answer a viewer's question about when to dump their lying man. The couple in question have been together for 3 years and are engaged, however he continues to lie to the woman, and she wants to know what to do. Dan states to just dump him. If he can't be honest with you and you're expecting to spend your life with him that seems like a bad idea. Jennifer explains most people lie when they don't feel safe enough to be honest. She says you need to think about if you're providing...
We start out in a large greenhouse, there are two gentlemen discussing pumpkin pies. There is an obvious expert and he states that there are pumpkins especially made for pies, but pumpkins tend to have a lot of water and he has gotten a lot of complaints that peoples pies are to runny. He has an answer with certain squashes that your family will still think it's pumpkin. Sweet meat squash still has the orange color on the inside but it has a much lower water content, cut it in half right arou...
YouTube user NotesCollegeAlgebra teaches you how to interpret a graph. You will learn how to read it and extract information. You go to the graph to see that f(-4)=-2. f(1.5)=2, so it's positive. You then have the question: For what x-values is f(x)<0? You go to the graph and see that you come up with (-5,3). The x-int is (3,0) (4,0). The y-int is (0,4). The domain is (-5,4) and the range is (-4,4). You then have the question: how often does y=7/5 intercept the graph? The answer is 4 times. T...
This video explores how to get the limit by getting a common denominator. When you try and plug in a limit, for example when the denominator goes to zero, you can get yourself into a situation where you get the answer (0/0) which is mathematically irrelevant. To solve this problem, you must find a common denominator and split the problem up into its various parts. By setting common denominators in the numerator, you can then flip the fraction around allowing you to properly calculate the limi...
This is the video about how to add a rational expression. So to add a rational expression first of all find the common denominator. To find the common denominator, just find the least common multiple (LCM) of the denominators. There are at least a couple ways of doing this. To convert each fraction to the common denominator, you multiply each denominator by what it needs in order to turn it into 6x. For instance, in the x+4/5x, the denominator needs to be multiplied by 6x, since 6xX5x = 30x. ...
This video demonstrates how to solve a linear function with rational coefficients by multiplying by the reciprocal of the coefficient. The reciprocal is just a fancy way of saying the numerator and denominator are swapped. Two sample problems are solved using this method. Multiplying each side of the equation by the reciprocal of the rational coefficient of the variable 'x' is an allowed operation, but only because both sides are multiplies by the the same amount. The teacher then demonstrate...
Learn how to add or subtract fractions with math in simple steps. First convert any story line you have into a fraction. Now you have to convert the denominators so that both the fractions have the same. To do so multiply both the numerators and denominators with the same number. Now when you have the same denominators add the numerators to get the answer. Reduce the fractions to a lower value if you wish. Try this out with some other examples.
In this tutorial the instructor shows how to calculate the sum of reciprocals of complex numbers. If you have to find out the sum of the reciprocals of two complex numbers first you will have to find out the least common multiple of the denominators. To do this multiply the numerator and denominator of the first fraction by the second complex number. Similarly multiply the numerator and denominator of the second fraction by the first complex number. Now you will have two fractions whose denom...
Follow this video to learn how to formulate calculations in Microsoft Excel. First type in a list of numbers in the cells. In order to calculate the median click on the cell where you want the answer to be shown. Then type equals, average, open bracket and insert the cell code where the first number is, colon, and then type in the cell where the last number in the list lies, and close brackets. In practice this is an example where the numbers are in a list from cell A1 to cell A11: =AVEARAGE(...
Excel is a powerful tool, but sometimes you need a guide to navigate its possibilities. This clip shows the difference between absolute and relative cell references so that any given formula, when copied, gives the results you want. Sometimes you will want to refer to the same cell, even when you are copying a formula to a different place on the worksheet. Other times, you will want the items in the formula to change as you copy them across the columns. You will see how such actions work thro...
Join Ty Yann and explore a coin puzzle with an unexpected answer. 1. Place a five hundred won coin on the top of another five hundred won coin. Make sure the top coin has the 500 level and showing. 2. Rotate the two coins, like a gear, and think of when the 500 will be straight again. 3. Will it be at quarter, a half, 3/4 or a full turn? Thing of your solution and then try it out. Were you correct?
This is a very interesting mathematical instructional video on how to find rational equation with no solution. How to solve the equation and check the answer. Let us take the example m over m-3 minus 4 is equal to 3 over m-3. In this equation we get m-4m+12 over m-3 is equal to 3 over m-3. When we simplify it further we get -3m +12 = 3. Or -3m = -9 and m = 3. This video teaches you very clearly how to solve a rational equation with no solution.
This is a mathematical instructional video on how to find the least common multiple. Let us now find the least common multiple for 25, 100, 18. This can be written as 5 square, 2 square multiplied by 5 square, 2 multiplied by 3 square. The highest factor in these numbers are, 5 square, 2 square and square. If you multiply 5 square with 2 square and 3 square you will get the final answer as 900. This is the least common multiple of 25, 100, and 18. This method is explained very clearly in this...
In this video, you will learn how to factor a simple trinomial. You will learn how to recognize a simple trinomial, and how to completely factor the trinomial. Also, it shows you how to factor square variables. The last example in the video explains how to factor out a negative first term. You can't just drop the negative and forget it is there. The instructor teaches you how to remove this negative, then reminds you not to forget to put the negative into your final answer.
This is the video about how to evaluate square roots. The square root of a number is a number that you can square to get it, that is, a number that you can multiply by itself to get the number. So, 2 is a square root of 4, because 2 x 2 = 4, and 3 is a square root of 9, because 3 x 2 = 9. (-2) x 2 is also 4 and (-3) x 2 is also 9. Numbers that have square roots always have two, a positive one and a negative one, but the square root symbol means only the positive one, so we can have one answer...
One can learn, from watching this video, how to multiply and divide fractions. Prof. Alexander gives a discourse on multiplication and division of fractions in a simple, easy way. For multiplication, one should first look for highest common factor in the numerator of one fraction and the denominator of the other, and vice versa, and if found, carry out the reduction by that factor. Then the numerator of one fraction is multiplied by that of the other fraction, the same operation is carried ou...
Need a little help in understanding the number line and graphing an inequality? Great! Here you will learn a valuable lesson with this how to do video. A basic tutorial, it explains what kind of dot to use when you are graphing inequalities. Then it shows you how to place the dot on the line and where to draw the line in answer to the problem. If you are just beginning your pre-algebra, then this quick video will get you pointed in the right direction.
This video shows how to multiply similar radicals. The basics of doing this is to multiply the root of the radicals. For instance, if you have the cubed root of 14 multiplied by the cubed root of 3, you would only multiply the root numbers. Thus, your answer would be the cubed root of 42. The exercises in this video show a few basic examples, but they can help you down the road when completing more complex problems that involve multiplying similar radicals.
This video demonstrates the simplest method for multiplying fractions. According to the tutor, one should first identify the highest common factor with which to reduce the two fractions, by themselves, and in relation to each other. The numerators of the two fractions are multiplied and the product is written down as the numerator of the resultant. The same operation is carried out on the denominators of the two fractions, resulting in the denominator of the resultant fraction. The final answ...
This video begins with teaching of percentage lesson. He is also teaching conversion of percentage to decimal and vise verse. This teaching is using advanced technology note pad when he goes on writing on pad that will display on screen. He is telling that percent 35% in decimal it is .35 and if decimal 2 it is 20% in percent. And he was teaching how to convert fraction to percent by taking one example 7/8 , to convert this first we have to divide 7 by 8 then we get answer .875 then to conver...
Confused with how to use your protractor for Geometry homework? In this helpful video, Doug Simmons from free math tutoring provides easy to understand classroom examples explaining how to use both sets of numbers on your protractor. Provides easy to remember rules that will keep you from fumbling with the common confusions of protractor use. Doug also explains common mistakes that you should avoid in order to start getting the right answers in your math problems. Finally, math tutorials at y...
The first step to getting over a broken heart is to change the contact information of your ex to do not answer. Delete all texts when they come. Do not look at it! Throw away all moments from your relationships. Leave it in the garbage can! If your ex wishes to have an item back, just give it back. However, don't get it back yourself. Recruit a friend or family member to drop off your ex's stuff. Find a hobby that helps you get over your relationship. Go on a date. Hang out with friends and f...
In this video tutorial the instructor shows how to calculate the acceleration of a car on an inclined plane. He goes on to solve a problem he came across which is based on the acceleration of a car on an inclined plane. He shows how to solve this problem by showing how to extract the data from the question and draws a diagram to get a clear understanding of the problem. Now he marks the forces acting on the vehicle and goes on to specify his axes and how to split the components of force along...
You can knit a scarf by learning how to combine two of the basic stitches that make up a knitters repertoire. One of the easier scarf patterns can be made by simply doing a garter stitch or stockinette stitch. You can take it to the next level by combining patterns to make a ribbed scarf. You begin by casting on a number enough stitches to make up the width of the scarf. The rest of the answers lie ahead in this video tutorial which will show everything you need to know to knit your own ribbe...
This video shows you how to get the quadratic equation for the quadratic function with roots; (5,0), (12,0) which passes through the point(8,6). It shows a man solving this problem using a black board and chalk to clearly demonstrate the method of plugging in the respective coordinates to arrive at an answer. After watching this video, any person over the age of twelve will know how to use quadratic functions to derive quadratic equations and solve mathematical problems with this particular m...
Fractions can look scary. But, don't worry, their bark is not as big as their bite! In this tutorial, learn how to multiply two fractions and simplify the answer into the smallest possible outcome. The basic process is to multiply straight across. Multiply the numerator times the numerator and the denominator times the denominator. You will arrive at a new fraction, from there you can simplify into the most tidy form of the fraction.
