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Big Ideas Math: Modeling Real Life, Grade 8

BI

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

1. Exponents

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Exercise 7 Page 321

Pay close attention to the order of operations.

- 7

Practice makes perfect

According to the order of operations, an exponent is calculated before a multiplication. Addition and subtraction are evaluated last.

9 - 2^5 * 0.5 For this, we must remember to evaluate the exponent first, the multiplication next, and finally the difference between their results.

Operation	Before Simplification	After Simplification
Calculate power	9 - 2^5 * 0.5	9 - 32 * 0.5
Multiply	9 - 32 * 0.5	9 - 16
Subtract term	9 - 16	- 7

The expression equals - 7.

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.320-321

Self-Assessment for Concepts & Skills p.321

Self-Assessment for Problem Solving p.322

Review & Refresh p.323

Concepts, Skills, & Problem Solving p.323-324