Réponse :
Explications étape par étape
R = (x + 5) (3 x + 1) + 2 (x² - 25)
R = (x + 5) (3 x + 1) + 2 (x-5) (x+5)
R = (x+5) [ 3x +1 + 2(x-5)]
R = (x+5) [ 3x +1 + 2x - 10)]
R = (x+5) (5x - 9)
M = (5x-7)² - 9 x² = (5x-7-3x)(5x-7+3x) on utilise: a²-b² = (a-b)(a+b)
M= (2x -7)(8x -7)
L = 6 ( 4 x - 5) - (4 x - 5)²
L = (4x -5) (6 - (4x - 5))
L= (4x -5) (6 - 4x + 5))
L= (4x -5) (11 - 4x)
F = 4x² - 9 - (2 x - 3) (5 x + 11)
F = (2x -3)(2x +3) - (2 x - 3) (5 x + 11)
F = (2x -3) [2x +3 -(5 x + 11)]
F = (2x -3) (2x +3 -5 x - 11)
F = (2x -3) (-3x -8)
j'espère avoir aidé
