Bonjour,
Il faut utiliser la double distributivité :
(a + b)(c + d) = a * c + a * d + b * c + b * d
A = (2x + 1)(x - 4)
A = 2x * x + 2x * (-4) + 1 * x + 1 * (-4)
A = 2x² - 8x + x - 4
A = 2x² - 7x - 4
B = (x - 3)(3x - 2)
B = x * 3x + x * (-2) - 3 * 3x - 3 * (-2)
B = 3x² - 2x - 9x + 6
B = 3x² - 11x + 6
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Bonjour,
Il faut utiliser la double distributivité :
(a + b)(c + d) = a * c + a * d + b * c + b * d
A = (2x + 1)(x - 4)
A = 2x * x + 2x * (-4) + 1 * x + 1 * (-4)
A = 2x² - 8x + x - 4
A = 2x² - 7x - 4
B = (x - 3)(3x - 2)
B = x * 3x + x * (-2) - 3 * 3x - 3 * (-2)
B = 3x² - 2x - 9x + 6
B = 3x² - 11x + 6