Réponse:
Salut
Explications étape par étape:
A = -(2x + 10) × (-7 x -1) + (-7 x -1) × (2x - 5)
= -(-7 x -1) × ((2x + 10) - (2x - 5))
= -(-7 x -1) × (2x + 10 - 2x + 5)
= -(-7 x -1) × 15
A = -15 (-7x-1)
B = 16x² + 48x + 36
= 4 (4x² + 12x + 9)
B = 4 (2x+3)
C = 81x² - 25
= 92x² - 5
= (9x)² - 5²
C = (9x-5)(9x+5)
D = 9x² - (8x + 1)²
= (x - (8x + 1))(3x + (8x + 1)
= (3x - 8x - 1)(3x + 8x + 1)
D = (-5x-1)(11x+1)
E =(-5x - 1)² + (7x + 6)(-5x -1)
=(-(5x + 1))² + (7x + 6) (- (5x + 1)
= (5x + 1)²- (7x + 6)(5x + 1)
= (5x + 1)(5x + 1 - (7x + 6))
= (5x + 1)(5x + 1 - 7x + 6)
E = (5x+1)(-2x-5)
F = (-5x - 1)² + (7x + 6)×(-5x -1)
= (-(5x + 1))²+(7x + 6)×(-5x + 1)
= (5x + 1)(5x + 1 -(7x + 6)
= (5x + 1)(5x + 1 - 7x - 6)
F = (5x+1)(-2x-5)
