Question

Diberikan f(x)= x^3-1 dan g(x)= x+1. Nilai (fog)(-5)=.....

Answer 1

(fog) = (x+1)^3 - 1
(fog)(x) = x^3 + 3x^2 + 3x + 1 - 1
(fog)(-5) = (-5)^3 + 3.(-5)^2 + 3.(-5) +1 - 1
(fog)(-5) = -125 + 75 - 15 + 1 - 1
(fog)(-5) = - 65
maaf ya, tadi lupa sama tanda ( - ) nya.. jadi salah ngitung..