jika f(x)=1-5x dan (f○g)(x)=-4-25x maka g(x-1) =

x - 1 = 1 - 5x
6x = 2
x = 1/3
(f○g)(1/3)= -4 - 25(1/3) =  -4 - 25/3 = (-12-25)/3 = -37/3

       fog = 4-25x
  f (g(x)) = 4-25x
1-5 g(x) = 4-25x
  - 5g(x) = 3-25x
      g(x) = 25x-3 / 5
   
    g(x-1) = 25(x-1)-3 / 5
               = 25x-25-3 / 5
               = 25x-22 / 5