Explications étape par étape:
On cherche le facteur commun
M = 6x + 18
M = (6 * 1x) + (6 * 3)
M = 6(x + 3)
N = 8x - 56
N = (8 * 1x) - (8*7)
N = 8(x - 7)
P = 7x² - 13x
P = (x * 7x) - (x * 13)
P = x(7x - 13)
R = 5x - 15x²
R = (5x * 1) - (5x * 3x)
R = 5x(1 - 3x)
