HELP! :(
Which function below is the inverse of f(x) = x2 − 9?

±square root of the quantity x plus 9

x squared over 9

±three times the square root of x

1 over quantity x squared minus 9

Question

HELP! :(
Which function below is the inverse of f(x) = x2 − 9?

 ±square root of the quantity x plus 9

 x squared over 9

 ±three times the square root of x

 1 over quantity x squared minus 9

campbell_st · Answer

if 

$$y = x^2 - 9$$

to find the inverse swap x and y then make y the subject 

so you start with 

$$x = y^2 - 9$$

now make y the subject.

falco276 · Answer

????

falco276 · Answer

I KNOW nOTHING ABOUT ALGEBRA!!!!!!!!

campbell_st · Answer

well add 9 to both sides of the equation and then take the square root