Réponse:
bonjour
Explications étape par étape:
2x + 2x = 4x (vrai)
2x +2x = 5x (faux car = 4x)
2x + 3 = 3x + 2 (faux car = 2x + 3)
2(x+3) = 5x (faux car = 2x + 6)
(3x+2)(3x+2) = 9x² + 12x + 4 (vrai)
= 9x² + 6x + 6x + 4
= 9x² + 12x +4
2x + 3 = 7 (faux car = 2x + 3)
2x + 3x = 5 (faux car = 5x)
2x + 3 = 3 + 2x (vrai)
2(x+3) = 2x + 6 (vrai)
2×x + 2×3
= 2x + 6
2x + 3 = 0 (faux car = 2x + 3)