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# Question 1: What is the cube root of -64? - PowerPoint PPT Presentation

Question 1: What is the cube root of -64?. 4 -4 8 -8 Go to question2. YES! That’s right!. (-4) × (-4) × (-4) = -64 Therefore the cube root of -64 = - 4 BACK. Oops ... that was not the right answer. Try again!. BACK. Oops ... that was not the right answer. Try again!.

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## PowerPoint Slideshow about 'Question 1: What is the cube root of -64?' - lucas

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Presentation Transcript

4

-4

8

-8

Go to question2

### YES! That’s right!

(-4) × (-4) × (-4) = -64Therefore the cube root of -64 = -4

BACK

### Oops ... that was not the right answer.Try again!

(4) × (4) × (4) = 64Therefore 4 is NOT the cube root of -64!

BACK

Oops ... that was not the right answer.Try again!

8 is the SQUARE ROOT of 64!

So this is not the correct answer since question is cube root of -64.

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Question 2: Between which of the following pairs of numbers does the cube root of 20 lie?

• Between 2.5 and 2.6

• Between 2.6 and 2.7

• Between 2.7 and 2.8

• Between 2.8 and 2.9

2.7³ = 2.7 × 2.7 × 2.7 = 19.6832.8³ = 2.8 × 2.8 × 2.8 = 21.95219.683 < 20 < 21.952So the cube root of 20 must be between 2.7 and 2.8

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Oops ... that was not the right answer.Try again!

2.5³ = 2.5 × 2.5 × 2.5 = 15.6252.6³ = 2.6 × 2.6 × 2.6 = 17.576Both 15.625 and 17.576 are smaller than 20! So this is not the correct answer!

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