Question

Given the function f(x) = 3x, find the value of f−1(27).

Answer 1

replace f(x) with y
y = 3x. Then solve for x meaning I need to have my x alone
y/3 =x that should be my inverse
y/3 = f^-1(y)
if y = 27
then
9 = f^-1(y)

it's been a long time since I have done this.. but I think I got it...?

Answer 2

sorry I'm super tired.. haven't slept well in a while.. no more school for me until late August so I can go late night on the pc

Answer 3

well the choices are
f−1(27) = 1
f−1(27) = 3
f−1(27) = 9
f−1(27) = 81

Answer 4

@usukidoll

Answer 5

try the 3rd one

Answer 6

i will. i have about 20 more questions on this test. ill let you know if its correct