Bonsoir.
Factoriser sans identités remarquables :
C = (2x+5)(7x-1)+4x+10
C = (2x-5)(7x-1)+2(2x+5)
C = (2x+5)(7x-1+2)
C = (2x+5)(7x+1)
D = (5x-3)2-9(2x+1)2
D = 2(5x-3)-9(2x+1)2
D = 2(5x-3)-18(2x+1)
D = 2(5x-3-9(2x+1))
D = 2(5x-3-18x-9)
D = 2(-13x-3-9)
D = 2(-13x-12)
Bonne soirée.