Diketahui f(x) = x²-x+12 dan g(x) = 4x+ 3. Tentukan komposisi berikut a. f•g(x) b. g•f(x) c. f•g(-4) d. g•f(3)

f•g(x) = f (g(x))
= (4x+3)² - (4x+3) + 12
= (16x²+24x+9) - (4x+3) + 12
= 16x²+24x+9-4x-3+12
= 16x²+20x+18
f•g(-4) = 16(-4)²+20(-4)+18
=16×16-80+18
=256-80+18
=194
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