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Big Ideas Math: Modeling Real Life, Grade 8

BI

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

Chapter Review

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Exercise 4 Page 363

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

- 0.0625

Practice makes perfect

The expression - ( 12)^4, or - ( 12) to the fourth power, can be written as the product of four - ( 12) terms. Note that in this case, there are no parentheses surrounding the negative sign. - a^n ⇔ -1(a^n)This means that we should evaluate as though parentheses surround the exponent and multiply the result by -1.

- (1/2)^4

Rewrite (1/2)^4 as (1/2)* (1/2)* (1/2)* (1/2)

- [(1/2)* (1/2)* (1/2)*(1/2)]

Multiply fractions

- (1/16)

Use a calculator

- 0.0625

Using a calculator, we can either enter - ( 12)^4 or - ( 12* 12* 12* 12). Both expressions give us the same answer.

Subchapter links

1 Exponents p.363

2 Product of Powers Property p.363

3 Quotient of Powers Property p.364

4 Zero and Negative Exponents p.364

5 Estimating Quantities p.365

6 Scientific Notation p.365

7 Operations in Scientific Notation p.365