Question

f(x) =sqrt x-5

find f-1

Answer 1

please add -1 to both sides of your equation

Answer 2

http://coolmath.com/algebra/16-inverse-functions/05-how-to-find-the-inverse-of-a-function-01.htm

Answer 3

Do you mean f(x)-1 or f^-1? :)

Answer 4

yes f-^1

Answer 5

is your function this?
\[f(x)=\sqrt{x-5}\]

Answer 6

i think lol

Answer 7

Kk, yeah, then you're looking for the inverse. :) Just follow the steps in the link I posted up there. ^.^

Answer 8

im still confused

Answer 9

Kay, I'll help. Here are the steps...

Step 1: Rewrite f(x) as y.
y = sqrt x-5

Step 2: Switch x and y.
x = sqrt y-5

Step 3: Solve for y.
y = x^2 + 5

Step 4: Rewrite y as f^-1(x).
f^-1(x) = x^2 + 5

Answer 10

A.

f-1 (x) = x2 +25; 25

B.

f -1 (x) = x2 + 5; y 5

C.

f-1 (x) = x2 +25; 5

D.

f -1 (x) = (x + 5)2; y 5

Answer 11

It's B. =]