Monday

March 2, 2015

March 2, 2015

Posted by **kelly** on Thursday, September 6, 2012 at 9:54am.

(-1/8)^1/3

Would you make it 3 square root of -1/8? I don't know how to go from there.

(256/81)^1/4

Same thing, would it become 4 square root (256/81)?

- Math -
**Reiny**, Thursday, September 6, 2012 at 12:10pm(-1/8)^1/3

= (-1)^(1/3) / 8^(1/3)

= -1/2

check: (-1/2)(-1/2)(-1/2) = -1/8

(256/81)^(1/4) ---- the fourth root

= 4/3

exponents in fraction form are roots

1/3 is cube root

1/4 is fourth root, etc

if you have an exponent like 2/3,

look at it as 2(1/3)

so 8^(2/3)

could be (8^2)^(1/3) = 64^(1/3) = 4

or

(8^(1/3) )^2= 2^2 = 4

**Answer this Question**

**Related Questions**

Math ~CHECK MY ANSWERS~ - 1) Which of these is a rational number? a. Pi b. ...

Algebra - Rationalize each expression by building perfect nth root factors for ...

Math ~CHECK MY ANSWER~ - 1) Which of these is a rational number? a. Pi b. Square...

Math - Just need some help... Directions: Multiply or raise to the power as ...

Math - What is the square root of 12? 3.464 Well, that's true, but you could ...

ALGEBRA - 1, Factor each expression x^2 - 10x - 24 A. (x + 4)(x - 6) B. (x + 6)(...

College Algebra - I need some help with a handful of questions. I need to see ...

College Algebra - I need some help with a handful of questions. I need to see ...

College Algebra help please - I need some help with a handful of questions. I ...

MATH - Which expression is a polynomial???? A: 11 0ver the square root of x B: ...