Jawapan

2016-01-28T16:31:16+08:00
F(x) = 4/2-x

f(x) = y
4/2-x = y
4 = y(2-x)
4 = 2y -xy
xy = 2y-4
x = 2y-4/y

f(x)-1 = 2x-4 /x