Réponse:
bonjour,
Explications étape par étape:
A = (x-2)(x-2)
= x×x - x×2 -2×x + 2×2
= x²- 2x - 2x + 4
= x² - 4x + 4
B = (x+3)(x+3)
= x×x + x×3 +3×x + 3×3
= x² + 3x + 3x + 9
= x² + 6x + 9
C = (3x+1)(3x+1)
= 3x×3x + 3x×1 + 1×3x + 1×1
= 9x² + 3x + 3x + 1
= 9x² + 6x + 1
D = (3x-2)(3x-2)
= 3x×3x - 3x×2 - 2×3x + 2×2
= 9x² - 6x - 6x + 4
= 9x² - 12x + 4
E = (2x+5)(2x-5)
= 2x×2x - 2x×5 + 5×2x - 5×5
= 4x² - 10x + 10x- 25
= 4x²- 25
