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Sagot :

Réponse :

A = (-4 + 1)(-3 + 1 - 5) = (-3)(-7) = 21

B = 3(4x - 2) = 12x - 6

C = (3x - 1)(2x + 5) = 6x² + 15x - 2x - 5 = 6x² + 13x - 5

D = 2x(x - 3) + 7x² - 2 = 2x² - 6x + 7x² - 2 = 9x² - 6x - 2

Explications étape par étape

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