Bonjour,
Il faut factoriser
I= -5X^2+15 X
I = 5x(-x + 3)
J= 4X(3+X)+(9+X)(3+X)
J = (3 + x)(4x + 9 + x)
J = (3 + x)(5x + 9)
K= (6-X)(2X-3)-(7X+4)(6-X)
K = (6 - x)(2x - 3 - 7x - 4)
K = (6 - x)(-5x - 7)
L=(X+9)(2X-3)+2X-3
L = (2x - 3)(x + 9 + 1)
L = (2x - 3)(x + 10)
M=(3+X)^2 -(5X+6)(3+X)
M = (3 + x)(3 + x - 5x - 6)
M = (3 + x)(-4x - 3)