Bonjour besoin d'aide : Factoriser les expressions. C = 7x² -3 x D = 16x² - 20x - 24 E =(a + 1)(3 + 8a) + (a + 1) F =(3a + 5)(3 + 8a) - (3a + 5) (2 + 5a) (il n'

bonsoir,

C = 7 x² -3 x  

C = x ( 7 x - 3 )

D = 16 x² - 20 x - 24  

d = 4 ( 4 x² - 5 x - 6 )

E =(a + 1)(3 + 8 a) + (a + 1)   = ( a + 1) ( 3 + 8 a + 1 ) =  ( a + 1 ) ( 8 a + 4 )

F =(3 a + 5)(3 + 8 a) - (3 a + 5) (2 + 5 a)

= ( 3 a + 5 ) ( 3 + 8 a - 2 - 5 a ) = ( 3 a + 5 ) (  3 a + 1 )