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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 33 Page 324

Pay close attention to the order of operations.

66

Practice makes perfect

According to the order of operations, the expression in the parentheses is performed first.

| 1/2 (7+5^3) | For this, we must remember to first evaluate the expression in parentheses, beginning with the exponent, then the addition. When we have calculated the parentheses, we can multiply and find the absolute value.

Operation	Before Simplification	After Simplification
Calculate power	\| 1/2 (7+ 5^3) \|	\| 1/2 (7+ 125) \|
Add	\| 1/2 ( 7+ 125) \|	\| 1/2 ( 132) \|
Multiply	\| 1/2 ( 132) \|	\| 66 \|
Find Absolute Value	\| 66 \|	66

The expression equals 66.

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