F(x)=x+3 dan g(x)=2x²+x-1 ditanya gof (3)...???

f(x) = x + 3
g(x) = 2x² + x - 1

(g o f) (x)
= 2(x + 3)² + (x + 3) - 1
= 2x² + 12x + 18 + x + 3 - 1
= 2x² + 13x + 20
(g o f) (3)
= 2(3)² + 13(3) + 20
= 18 + 39 + 20
= 77