Question

Help help help help thanks lol

Answer 1

`f(x)=x^2-81\\ y=x^2-81\\ x^2=y+81\\ x=\pm √(y+81)\\ f^(-1)(x)=\pm √(x+81)\\`


`f(x)=2x-6\\ y=2x-6\\ 2x=y+6\\ x=(1)/(2)y+3\\ f^(-1)(x)=(1)/(2)x+3\\ f^(-1)(2)=(1)/(2)\cdot2+3\\ f^(-1)(2)=1+3\\ f^(-1)(2)=4`