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Big Ideas Math: Modeling Real Life, Grade 8

BI

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

4. Rational Numbers

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Exercise 3 Page 399

Think of a number that results in 125 when multiplied by itself three times.

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Practice makes perfect

We want to evaluate the given expression. 7*sqrt(125)-12 We need to remember the order of operations. In this case, we will calculate the cube root. Then, we will multiply the terms and finally we will subtract 12 from the result. To find the cube root of 125. We need to think of a number that, when multiplied by itself three times, results in 125. ?^3= 125 Since 5 raised to the third power is 125, the number we are looking for is 5.

(5)(5)(5)

ProdToPowThreeFac

a* a* a=a^3

5^3

Calculate power

125

This means that the cube root of 125 is 5. 7sqrt(125) - 12 calculate root ⟶ 7(5) - 12 Now, we can perform multiplication and then subtraction.

7(5) - 12

Multiply

35 - 12

Subtract term

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Subchapter links

Try It p.396-397

Self-Assessment for Concepts & Skills p.397-398

Review & Refresh p.399

Concepts, Skills, & Problem Solving p.399-400