Question

Ill give a medal (:
If f(x) = x^2 -1, what is the equation for f^–1(x)?

Answer 1

y= x^2-1
replace x and y
x = y^2-1
now find y from here...
start by adding one to both sides :)

Answer 2

haha thanks...but its just the solving part that i dont understand :/

Answer 3

no problem, thats where i gave you a head start
ADD 1 to both sides, what u get ?

Answer 4

x+1=y^2?

Answer 5

good!
now take square root on both sides ..
and viola, you are done!

Answer 6

ohh okay so the answer is just +or - the square root of x+1?

Answer 7

correct :)
it looks like \(\large f^{-1}(x)=\pm \sqrt{x+1}\)

Answer 8

oh i got it thank you (:

Answer 9

welcome ^_^