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Big Ideas Math: Modeling Real Life, Grade 8

BI

Big Ideas Math: Modeling Real Life, Grade 8 View details

1. Parallel Lines and Transversals

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Exercise 4 Page 108

Pay close attention to the order of operations.

14

Practice makes perfect

According to the order of operations, exponents are evaluated before multiplication, while addition and subtraction are evaluated last. For the given expression, this means evaluating the exponent first, then evaluating the product, and finally the difference.

Operation	Before Simplification	After Simplification
Calculate power	5(2)^2-6	5( 4)-6
Multiply	5( 4)-6	20-6
Subtract term	20- 6	14

The expression equals 14.

Alternative Solution

Using a Calculator

We can also evaluate this expression using a calculator. To do so, type it as shown below.

Subchapter links

Try It p.104-106

Self-Assessment for Concepts & Skills p.106

Self-Assessment for Problem Solving p.107

Review & Refresh p.108

Concepts, Skills, & Problem Solving p.108-110