HASSAN2357
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Sagot :

Réponse :

Bonsoir,

Explications étape par étape :

-7x (-5x + 3) = -7x (-5) - 7x x 3 = 35x² - 21 x

(2x - 7)(-4x + 5) = -8x² + 10 x + 28x - 35 = -8x² + 38x - 35

(5x + 1/2)² = (5x)² + 2 x 5x x 1/2 + (1/2)² = 25x² + 5x + 1/4

(-2x-3)(3x²-x + 1) = -6x³ + 2x² - 2x - 9x² + 3x - 3 = -6x³ - 7x² + x - 3