Jika f(x) = x2 + 3x dan g(x) = x – 12, maka nilai (f o g)(8) adalah?

(fog)(x)= f(g(x))
=(x-12)^2 +3(x-12)
=x^2 -24x + 144 +3x -36
=x^2 -21x + 108

(fog)(8) = 8^2 -21(8) +108
=64-168+108
=104