Question

find f^-1(x) given f(x) =3sqrt(x-8)

Answer 1

solve your f(x) function for x. then replace the f(x) with x and the x with f(x). If you need help just ask.

Answer 2

\[y=3\sqrt{(x-8)}\]swap x and y, then solve for y
\[x=3\sqrt{(y-8)}\]
y=?

Answer 3

sorry my internet was out for a couple minutes.

ok, yes you can swap x and y at the beginning or the end of the process.

x = 3*sqrt(y-8)
x/3 = sqrt(y-8)
(x/3)^2 = (y-8)
(x/3)^2 + 8 = y

hope that helps

Answer 4

no, thanks I am talking about inverse not multiplying exponets, I have figured it out, thanks

Answer 5

oh for anyone who make look up this question later
the its f(-1)= 3x+8