dik:(gof)(x)=2xkuadrat+4x+5 g(x)=2x+3 Nilai f (x)=

diketahui : g(x) = 2x + 3
            (gof)(x) = 2x² + 4x + 5 
(gof)(x) = g(f(x))

g(f(x)) = 2(x²+2x) + 5
           = 2(x²+2x+1) + 3

Jadi f(x) = x² + 2x + 1