Bonsoir,
Factoriser:
A= (x+1)(x+2)-5(x+2)
= (x+2)(x+1-5)= (x+2)(x-4)
B= (x+1)(x-3)-(x+1)= (x+1)(x-3-1)= (x+1)(x-4)
C= (2x+3)² -(x+5)(3+2x)
= (2x+3)(2x+3-x-5)= (2x+3)(x-2)
D= (2x-5)² +(x-3)(4x-10)= (2x-5)² +2(x-3)(2x-5)= (2x-5)[(2x-5+2(x-3)]
= (2x-5)(2x-5+2x-6)= (2x-5)(4x-11)
