diketahui fungsi f(x)=2x+5 dan g(x)= -1/2x-6

f(x)=2x+5 dan g(x)= -1/2x-6

(fog)(x) = f(g(x))
            = 2(-1/2x-6) + 5
            = (-2/2x-6) + 5

(gof)(x) = g(f(x))
            = -1/2(2x + 5) - 6
            = -1/(4x + 10 - 6)
            = -1/(4x + 4)