Réponse :
A = -5(x +2) = -5×x + (-5)×2 = -5x + (-10) = -5x - 10
B = -3 ( x - 2 ) = -3×x - (-3)×2 = -3x - (-6) = -3x + 6
C = x ( x + 3 ) = x×x + x×3 = x² + 3x
D = x ( 4 - x ) = x×4 - x×x = 4x - x²
E = -3x ( x + 4 ) = -3x×x + -3x×4 = -3x² + (-12x) = -3x² - 12x
F = 2x ( x - 7 ) = 2x×x + 2x×7 = 2x² + 14x
G = 6x ( 2x + 1 ) = 6x×2x + 6x×1 = 12x² + 6x
Essaie de faire le dernier
Forme développé souligné
Explications étape par étape
