Determine f-1(x) for f(x)= cubed root of x-3?

Question

Determine f-1(x) for f(x)= cubed root of x-3?

Answer 1

f inverse??

y= cubed root of( x-3)

swap x and y

x= cubed root of (y-3)

cube both sides

x^3 = y-3

x^3 +3 = y   ===> f inverse

Answer 2

f(x) = ³V (x - 3)

y = ³V(x - 3)

y³ = x - 3

y³ + 3 = x

--> f-1(x) = x³ + 3

Alejandra