diket:f(x+2)=x-8per x+2 maka tentukan inversnya dan invers 3

f(x+2) = x-8 /x+2
misal x+2 = a
x = a -2

f(a) = a-2-8 /a-2+2
f(a) = a-10/a
f(x) = x-10/x

f(x) = x-10/x
y = x-10/x
xy = x-10
xy-x = 10
x(y-1)= 10
x = 10/y-1

f^-1(x) = 10/x-1

f^-1(3) = 10/3-1
=5