bonsoir
distributivité
D = - x * 2 + ( - x * - 4 x ) = - 2 x + 4 x²
E = - 2 x² + 6 x
F = 21 x² - 35 x
D = x[2+(-4x)]
= (x * 2) + [x * (-4x)]
= 2x - 4x²
E = -2x[x+(-3)]
= (-2x * x) + [-2x * (-3)]
= -2x² + 6x
F = 7x[3x+(-5)]
= (7x * 3x) + [ 7x * (-5)]
= 21x² - 35x
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bonsoir
distributivité
D = - x * 2 + ( - x * - 4 x ) = - 2 x + 4 x²
E = - 2 x² + 6 x
F = 21 x² - 35 x
Si ta consigne est de développer les expressions, voici ce que je peux faire pour toi.
D = x[2+(-4x)]
= (x * 2) + [x * (-4x)]
= 2x - 4x²
E = -2x[x+(-3)]
= (-2x * x) + [-2x * (-3)]
= -2x² + 6x
F = 7x[3x+(-5)]
= (7x * 3x) + [ 7x * (-5)]
= 21x² - 35x