Question

F(x) = (x + 9), find f-1(x)

Answer 1

Explanation:

you mean f^(-1) (x), so the inverse function, right ?

we find the inverse function by going back to the basic definition with a result variable : f(x) = y

and so,

y = x + 9

now we transform this equation, so that we end up with x alone n on one side and everything else in the other side :

y - 9 = x

and now we just rename x to y and y to x to turn this into a "regular" function :

x - 9 = y

or

y = x - 9

and that is the inverse function of the original function.

f^(-1) (x) = x - 9