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Math Video Transcript

00:00:02.120 You can add like terms together to simplify an expression. 00:00:07.000 This lesson shows you how. 00:00:10.130 Now, let's learn the basic understanding in simplifying expression. Take these like terms, 3 x -2 x, as an example. 00:00:20.210 First, let's focus on 3x. You can see that 3x is equals to x + x + x. 00:00:35.150 Now, as for -2x, -2x is equals to -x -x. 00:00:46.010 When you add 3x and -2x together, notice that x and -x here cancel off. 00:00:54.070 Same goes for +x and -x here. 00:01:01.110 Notice that after adding these terms, you're left with one x. 00:01:06.140 Now that you understand the basic behind adding like terms. Let's take a faster way of doing this. 00:01:13.130 Just take 3 from 3x, minus 2 from 2x. Immediately, you get the 1 and the answer is 1x. 00:01:24.060 Also, one thing you should take note. It's better to write 1x as x. 00:01:32.230 Let's look at another example. Now let's simplify 7u + q -5u + 4q. 00:01:40.130 First, arrange the like terms together like this. 00:01:49.020 After arranging, you have 7u -5u and +q + 4q. 00:01:57.190 Now add the like terms q and + 4q. This gives 5q. 00:02:05.110 Add the like terms 7u and -5u. This gives 2u. 00:02:12.060 As there is no more like terms, This is the simplest expression you can get. So the answer is 2u + 5q. 00:02:18.240 So the answer is 2u +5q. 00:02:25.100 Let's take another example, 7 u + 3 v square -2 u + 5 v square. 00:02:32.220 First, arrange the like terms together like this. 00:02:42.150 After arranging, you have 7u, -2u and + 3v square + 5v square. 00:02:52.040 Now add the like terms + 3v square + 5v square . This gives 8v square. 00:03:00.080 Add the like terms 7u and -2u. This gives 5u. 00:03:06.240 As there is no more like terms, This is the simplest expression you can get. So the answer is 5u +8 v square. 00:03:19.050 That's all for this lesson. Try out the practice questions to test your understanding.

Multiple Choice Questions (MCQ)

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1. Question 1 on simplifying expression
2. Question 2 on simplifying expression

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