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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 8 Page 321

Pay close attention to the order of operations.

1

Practice makes perfect

According to the order of operations, an exponent is calculated before a Division.

| - 3^3 ÷ 27 | For this, we must remember to evaluate the exponent first, the division next, then the negative, and finally the absolute value of the result.

Operation	Before Simplification	After Simplification
Calculate power	\| - 3^3 ÷ 27 \|	\| - 27 ÷ 27 \|
Divide	\| - 27 ÷ 27 \|	\| - 1 \|
Calculate Absolute Value	\| - 1\|	1

The expression equals 1.

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