Réponse:
bonjour
Explications étape par étape:
A = 5x² -2x
= x(5x -2)
B = 36 - x²
= (x - 6)(x + 6)
C = x² + 20x +100
= x² +2×x×10 + 10²
= (x + 10)²
D = (2x+1)(x-3) - (2x+1)(2x+7)
= (2x+1)(x-3-(2x+7))
= (2x+1)(x-3-2x-7)
= (2x+1)(-x -10)
E = (3x+1)² - (2x-5)²
= (3x+1-(2x-5)) × (3x+1+(2x-5))
= (3x+1-2x+5)(3x+1+2x-5)
= (x+6)(5x-4)
