Réduire H=(3a 4)(a 7) 5(3a-1) Merci d'avance :)

Bonjour 00Marie00,

H = (3a+4)(a+7) + 5(3a-1)
H = (3a²+21a+4a+28) + (15a-5)
H = 3a²+25a+28+15a-5
H = 3a² + 40a + 23

bonjour,

(3a²+21a+4a+28)+15a-5 =
3a²+25a+28+15a-5 =
3a²+40a+23