Question

if f(x) = 3x -7, then f^-1 (x)=

Answer 1

um what now?

Answer 2

any help?

Answer 3

i dont understand what you said

Answer 4

no... yeah i know wow must be stupid

Answer 5

lazy no i want to understand it i have a big test coming up am try to understand it not get the answer

Answer 6

Still need help

Answer 7

@wesley2514 to find the inverse of a function, you have to first change the "f(x)" to a "y"...like this

y = 3x - 7

The second step is to interchange the x and y variables...

x = 3y - 7

The third step is to just solve for y...

x + 7 = 3y
x + 7/3 = y

Your last step is to plug the "f^-1(x)" back in for y, like this...

f^-1 (x) = \[\frac{ x+7 }{ 3 }\]