F(x)=3-½x tentukan nilai f-¹(-2)

f(x) = 3-½x
f-¹(x) =.....? (dicari dulu)
f-¹(x) = y= 3-½x
-½x = y-3
x = -y-3.2
x = -y-6
f-¹(x)= -x-6
f-¹(-2) = -(-2)-6
f-¹(-2) = +4-6
f-¹(-2) = -2