Question

This is a homework paper that i had to do and i got it back and these questions i got wrong, Please help it's been awhile since ive been in school.

1.For the function f(x)=x^2-12 Find (f o f^1)(4)
A)4
B)6
C)0
D)10
I had C but it was wrong.

2. Graph y=-2x+3 and its inverse (pictures are for number 2)

Answer 1

a function composed with its inverse is x
(f o f⁻¹)(x)=x
(f o f⁻¹)(4)=4

answer is A


2.ok so
the inverse is the reflection across the y=x line
the only one that looks like it reflected is the 1st one