Jika f(x + 1) = x² – 1 dan g(x) = 2x

by

maka (g ⚬ f)(x) =

2x² – 4x
Pembahasan:
f(x + 1) = x² – 1
f(x) = (x – 1)² – 1
       = x² – 2x + 1 – 1
       = x² – 2x
(g ⚬ f)(x) = g(f(x))
                = g(x² – 2x)
                = 2(x² – 2x)
                = 2x² – 4x
  Diketahui matriks A = (2-114), B = (x+y23y) C = (7231)