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Big Ideas Math: Modeling Real Life, Grade 7

BI

Big Ideas Math: Modeling Real Life, Grade 7 View details

4. Simulations

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Exercise 4 Page 311

Be careful with negatives when distributing.

-21x-7

Practice makes perfect

We want to simplify the given expression. To do it, we will use the Distributive Property. We will distribute -7 to the terms inside the parentheses.

- 7(1+3x)

Distribute - 7

-7(1)+(-7)(3x)

(- a)b = - ab

-7+(-21x)

a+(- b)=a-b

-7-21x

CommutativePropAdd

Commutative Property of Addition

-21x-7

The expression cannot be simplified further because - 21x and -7 are not like terms.

Subchapter links

Try It p.308-309

Self-Assessment for Concept & Skills p.309

Self-Assessment for Problem Solving p.310

Review & Refresh p.311

Concept, Skills, & Problem Solving p.311-312