Question

f(x) = 2x − 6. Solve f−1(x) when x = 2.

−5
4
−2
7

Answer 1

Replace f(x) with y
y=2x-6
Now write x in terms of y
x=(y+6)/2
Replace x with f-1(x) and y with x
f-1(x)=(x+6)/2
put x=2 and u will get 4.