f(x)=2x-1 (fog)(x)=2xkuadrat+2 g(x) ?

(fog)(x) = 2x² + 2
f(g(x)) = 2x² + 2
(2x - 1)(g(x)) = 2x² + 2
2 g(x) - 1 = 2x² + 2
2 g(x) = 2x² + 3
g(x) = x² + 3/2