Bonjour,
5x - xy = x(5-y)
a² + 3ab = a(a+3b)
12a - 12ab = 12a(1-b)
60x³ - 24x⁵ + 36x² = 12x²(5x-2x³+3)
7x² - 28x⁴ + 70x³ = 7x²(1-4x²+10x)
3(2+x) + (2+x)×x = (2+x)(3+x)
(x-3) + 2x(x-3) = (x-3)(1+2x)
(5x+2y)(5+x) + 2(5x+2y) = (5x+2y)(5+x+2) = (5x+2y)(x+7)
(7-4x)(x+4) - (x+4)(7+3x) = (x+4)[(7-4x)-(7+3x)] = (x+4)(-7x)
(7-9x)(1+x) - 3(7-9x) = (7-9x)(1+x-3) = (7-9x)(x-2)
(5+2x)(5-x) - (5+2x) = (5+2x)(5-x-1) = (5+2x)(4-x)
(2+x)² + 3(2+x) = (2+x)(2+x) + 3(2+x) = (2+x)(2+x+3) = (2+x)(x+5)
