Bonjour,
Exercice 41:
A = x²-16 = (x-4)(x+4)
B = 9x²-24x+16 = (3x-4)²
C = x²+20x+100 = (x+10)²
Exercice 42:
D = (x+1)²-4 = ((x+1)-2)((x+1)+2) = (x-1)(x+3)
E = (x-2)²-9 = ((x-2)-3)((x-2)+3) = (x-5)(x+1)
F = (3x-1)²-1 = ((3x-1)-1)((3x-1)+1) = (3x-2)3x
Voila si tu as des question j'y répondrais avec plaisir :)
