diket : f(x) = 3x + 2/ 2-x, tent, f pangkat -1 (-2)

f(x) = 3x+2/2-x

misal :
y = f(x)

y = 3x+2/2-x

y(2-x) = 3x+2

2y-yx = 3x+2

-yx-3x = 2-2y

x(-y-3) = 2-2y

x = 2-2y/ (-y-3)

f-1(x) = 2-2x/ (-x-3)

f-1(-2) = 2-2(-2)/ (-(-2)-3)

f-1(-2) = 2+4/ 2-3

= 6/ -1

= -6

*sorry kalo ada yang salah