Bonjour,
F= (2x-1)(x-5)+(3x+7)(x-5)
le facteur commun est : (x-5)
F = (x - 5)[(2x-1)+(3x+7)]
F = (x-5)(5x - 6)
F = 5x² + 6x -25x -30
F = 5x² -19x - 30
G = (2x + 5)(x - 3) + (2x + 5)(-3x + 1)
G = (2x + 5)[ (x - 3) + (-3x + 1)]
G = (2x + 5) ( -2x - 2)
G = -4x² - 4x - 10x - 10
G = -4x² - 14x - 10
Bonne journée
