Question

Given the function f(x) = 3x, find the value of f−1(81).

f−1(81) = 1
f−1(81) = 2
f−1(81) = 3
f−1(81) = 4

Answer 1

@jhonyy9

Answer 2

you need to solve 3x=81

Answer 3

do you mean 3^x?

Answer 4

yep... my bad

Answer 5

if 3x=y
and x=1/3y
and finv tells you what x you put in given a resultant y
so x=1/3y is your f^-1
y=81
x=1/3*81=27 i think

Answer 6

What do you think it is?