Question

Let f(x) = 5x + 12. Find f-1(x).

Answer 1

So far i have:
f(x) = 5x + 12
y = 5x + 12
x = 5y + 12
sqrtx = sqrt5y + 12

Answer 2

Find y there in terms of x..

Answer 3

I have (x - 12)/(5)

Answer 4

I mean from this equation : x = 5y + 12

Finding y in terms of x..

\(x - 12 = 5y\)

Answer 5

Or would it be (5)/x - 12?
Im quite sure its (x-12)/(5)

Answer 6

What else, replace y with \(f^{-1}(x)\) there..

Answer 7

you are right

Answer 8

I am?

Answer 9

its (x-12)/(5)? @acxbox22

Answer 10

Yes, what you have is what you are looking for.. :)

Answer 11

Yep..

Answer 12

yes that is the inverse
y=(x-5)/12

Answer 13

Thank you very much!

Answer 14

Yes, but why are you missing LHS??

Do write LHS there with your answer.. :)

Answer 15

LHS?

Answer 16

You have:

\[y = \frac{x-12}{5} \implies f^{-1}(x) = \frac{x-12}{5}\]

Answer 17

LHS : Left Hand Side
RHS : Right Hand Side..

An equation must contain LHS and RHS..

Answer 18

true..i forgot that

Answer 19

I seem to have not learned that yet...Will do because maybe i can get extra credit!

Answer 20

I am just saying, that you should not (x-12)/5 alone..

Do mention what is it equal to..

It is actually : y = ..........