Bonjour
Développer ?
H = (x – 3)(7x – 4)
H = 7x² - 4x - 21x + 12
H = 7x² - 25x + 12
I = (4x + 1) (5x-9a)
I = 20x² - 36ax + 5x - 9a
J = 2(5x+7) +8 (4x+9)
J = 10x + 14 + 32x + 72
J = 42x + 86
K = 5x(2x +1) -7 (8-2x)
K = 10x² + 5x - 56 + 14x
K = 10x² + 19x - 56
L= (9-2x) (2x+7) -2x(8x +4)
L = 18x + 63 - 4x² - 14x - 16x² - 8x
L = - 4x² - 16x² + 18x - 8x - 14x + 63
L = - 20x² - 4x + 63.
