Question

Let f(x) = x^2 − 81. Find f^−1(x).

Answer 1

PLeaseee helpp

Answer 2

so this question is to find the inverse of this function right

Answer 3

first switch x and y

Answer 4

i think so

Answer 5

\[x = y^{2}-81 \]

Answer 6

so then you would solve for y to find the inverse

Answer 7

im confused on that part

Answer 8

you get what I did in the first part right?

Answer 9

yes

Answer 10

so now we have this

\[x = y^{2}-81 \]

Answer 11

now to solve for y it's easy we have to get y by itself.

\[x+81 = y^{2}\]

Answer 12

so far so good?

Answer 13

okay thnk so

Answer 14

now we take the square root of both sides:

\[\sqrt{x+81} = y \]

Answer 15

oh so it would be plus or miuns?

Answer 16

I think that would be it

Answer 17

yay thanks man