MathKit - Simplifying Expressions

Simplifying Expressions

Expressions are like equations that don't have a set value. You usually only see them with problems that have variables, and no product.

It's important to simplify expressions, because they are a lot easier to process in scenarios.

Simplifying expressions is pretty simple. You just need to follow the order of operations. The order is:

You can memorize this with the handy acronym:

PEMDAS
Please Excuse My Dear Aunt Sally.

Additionally, if possible, combine like terms, like 7x and 3x by adding them together to help simplify an expression.

Table of Contents

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Simplify the expressions

Example A: 3x + 5x − 2

Example B: 7a − 4 + 2a + 9

Example C: 6x + 4 − 3x + 9

Answers

Example A: 3x + 5x − 2

Step 1: Combine like terms

(3x + 5x) − 2

= 8x − 2

Example B: 7a − 4 + 2a + 9

Step 1: Combine like terms

(7a + 2a) + (−4 + 9)

= 9a + 5

Example C: 6x + 4 − 3x + 9

Step 1: Combine like terms

(6x − 3x) + (4 + 9)

= 3x + 13

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