F(x) =2xpangkat 2 +3x-5 dan g(x)=4x-3 Jika (g•f) (2) dan jika (f•g) (2)

jawab

f(x) = 2x² + 3x  - 5
g(x)= 4x - 3


(gof)(2) = g { f(2)}
= g { 2(2)² + 3(2) - 5)}
= g (8+6-5)
= g(9)
= 4(9) - 3
= 36-3
= 33

fog(2) = f { g(2)}
= f {4(2) - 3}
= f (8-3)
= f(5)
= 2(5)² + 3(5) - 5
= 50 + 15 - 5
= 60