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How to Simplify Expressions


Without parentheses

Recall the following vocabulary:

Variable - a letter representing an unknown value; the value changes or varies depending on the situation, thus called a variable

Coefficient a number in front of the variable; for example 5x; 5 is the coefficient

Constant the part of the expression or rule that does not change; n + 6 or y + 3; 6 and 3 are the constants

Terms each addend in the above expressions are called a terms

Like terms have the same variable parts and exponents

Example: 3x + 5 + 3y + 4x +12

The like terms are 3x and 4x ; 5 and 12
Thus, the expression becomes 7x + 3y + 12.
Note, it is customary to write the terms in alphabetical order, and write the constants last.

Some students would say 3x and 3y are considered like terms. This assumption is incorrect. Why? The variables are different.

Steps:

1 Change all subtraction to addition of the opposite of the following term. In other words, change the subtraction operand (-) to addition (+) and change the sign of the following number. If the number is positive, change it to a negative number and vice versa.
2 Combine like variables. Since, we changed everything to addition in the first step, add. Just remember the rules to adding integers.

Simplify the following expressions:

1) -8k + 2k
2) 11c + c + 5c
3) 5x + y 6x + y
4) 12a 16b 8ab +16b
5) 9x 4y 3x + 6y




Answers:

1) -8k + 2k (Add coefficients of like terms)
-6k

2) 11c + c + 5c (Add coefficients of like terms)
17c (Note: 1 is the coefficient for c; the original problem could be rewritten as 11c + 1c + 5c)

3) 5x + y 6x + y (Change subtraction to addition)
5x + 1y + (-6x) +1y (Add coefficients of like terms)
-x + 2y

4) 12a 16b 8ab +16b (Change subtraction to addition)
12a + (-16b) + (-8ab) + 16b (Add coefficients of like terms)
12a - 8ab

5) 9x 4y 3x + 6y (Change subtraction to addition)
9x + (-4y) + (-3x) + 6y (Add coefficients of like terms)
6x + 2y




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Integers - Adding Integers
Integers - Multiplication and Division
Introducing Algebra - Unknown Variables
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Content copyright © 2014 by Beverly Mackie. All rights reserved.
This content was written by Beverly Mackie. If you wish to use this content in any manner, you need written permission. Contact Beverly Mackie for details.

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