Explications étape par étape:
A=(2 X+3)(5 x-2)+((4 x-1)(4 x-1)
A=(10 x2 -4 X +15 x-6)+4 x2 -4x-4x +1
A=10 x2 + 11 X -6 +4 x2 -8 X +1
A=10 x2+ 4 x2 + 11 X -8 X -6+1
A=14 x2 +3 X -5
B(3 x-4)(3x-4)-(6x-5)(6x-5)
B=(9x2-12x-12x+16)-(36x2-30x-30x+25)
B=9x2-24x+16-(36x2-60x+25)
B=9x2-24x+16-36x2+60x-25
B=9x2-36x2-24x+60x+16-25
B=-27x2+36x-9
