Fungsi f:R-->R ditentukan dengan rumus f(x)=5x+2 dan g:R-->R ditentukan demgan rumus g(x):6-7x tentukan (fog)8^-1(-3)

(fog)(x) = f(g(x)) = f(6-7x) = 5(6-7x)+2 = 30-35x+2 = 32 - 35x

(fog)(x) = 32-35x
y = 32-35 x
-35x = 32 - y
x = 32-y/-35
x = -32+y/35
(fog)^-1(x) = -32+x/35
(fog)^-1(-3) = -32-3/35 = -35/35 = -1