mulitple choice help

[josh123]

If f(x) = (x - 2)1/3, then f -1(x) =

a. (x^3 + 1)/2
b. (x^3 - 1)/2
c. (x^3 + 2)/2
d. (x^3 - 2)/2 I know this isn't it
e. x^3 - 2
f. x^3 + 2
g. none of these


Is it either e or f?

 

[K]

If f(x) = (x - 2)1/3, then f -1(x) =

a. (x^3 + 1)/2
b. (x^3 - 1)/2
c. (x^3 + 2)/2
d. (x^3 - 2)/2 I know this isn't it
e. x^3 - 2
f. x^3 + 2
g. none of these


Is it either e or f?

F

Here's why:

(x - 2)^(1/3) = y

x - 2 = y^3
x = y^3 + 2