diketahui (gof)(x) invers= 5x+1/4x+8, (gof)(x) adalah...

gof(x) invers=(5x+1)/(4x+8)
y(4x+8)=(5x+1)
4xy+8y=5x+1
8y-1=5x-4xy
8y-1=x(5-4y)
(8y-1)/(5-4y)=x
gof(x)=(8x-1)/(5-4x)

Fungsi Invers

{gof}⁻¹ (x)=  (5x +1)/(4x +8)

gof(x) = [ (gof)⁻¹}⁻¹
gof(x) = (8x - 1)/(-4x + 5) 
atau   = (8x -1)/(5 - 4x)