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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 323

When multiplying two negative numbers, we obtain a positive product.

- 8

Practice makes perfect

The expression (- 2)^3, or - 2 to the third power, can be written as the product of three - 2 terms. Note that when multiplying two negative numbers, we obtain a positive number. (- a)(- a) = a* aThis means that any real negative number raised to an odd power will result in a negative result.

(- 2)^3

Rewrite (- 2)^3 as (- 2)* (- 2)* (- 2)

(- 2)* (- 2)* (- 2)

MultNegNegTwoPar

(- a)(- b)=a* b

- 2* 2* 2

Identity Property of Multiplication

- 8

Using a calculator, we can either enter (- 2)^3 or - 2* 2* 2. Both expressions give us the same answer.

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