Réponse :
a. (-4x + 5)(x + 8) = 0
-4x² - 32x + 5x + 40 = -4x² - 27x + 40 = 0
b. (8x + 10)(-11x - 20) = 0
-88x² - 160x - 110x - 200 = -88x² - 270x - 200 = 0
c. (-2X + 7)(11x - 4) = 0
-22x² + 8x + 77x - 28 = -22x² + 85x - 28 = 0
d. (-15x - 16)(-x + 19) = 0
15x² - 285x + 16x - 304 = 15x² - 269x - 304 = 0
e. (2x + 9)(10x + 17) = 0
20x² + 34x + 90x + 153 = 20x² + 124x + 153 = 0
f. (-18x - 6)(-17x - 7) = 306x² + 136x + 102x + 42 = 306x² + 238x + 42 = 0
Explications étape par étape
