F(x) =4x+3 (gof)(x) =x²+1 g(15) =?

(gof)(x) = (x² + 1) (gof)(x) = f(g(x)) f(g(x)) = 4(g(x)) + 3 (x² + 1) = 4(g(x)) + 3 (g(x)) = (x² - 2) / 4 g(15) = (15² - 2) / 4 g(15) = (225 - 2) / 4 g(15) = 223 / 4 g(15) = 55.75

Ответ: g(15) = 55.75