Given the function f (x) = 6 (x+2) - 3, solve for the inverse function when x = 21.

-45

0

2

63

The invese switches x and y so basically

if

f (21) = z then f⁻¹ (z) = 21

therefor

f (z) = 21 and f⁻¹ (21) = z

basically solve for the value that makes the functino equal 21

21=6 (x+2) - 3

add 3 both sides

24=6 (x+2)

divide by 6

4=x+2

minus 2

2=x

answer is 2