bonjour
on calque l'exemple et on aura
B = x*x + x*6 - 4*x - 4*6
= x² + 6x - 4x - 24 = x² + 2x - 24
C = a*2a + a*(-7) - 5*2a - 5*(-7)
= 2a² - 7a - 10a + 35 = 2a² - 17a + 35
D = 4x+12 - x³-3x² = -x³-3x²+4x+12
E = 15x²+3x-10x-2 = 15x²-7x-2
F = -4-12x+2x+6x²=6x²-10x-4
G=x²+3x+3x+9=x²+6x+9
H=4-2x-2x+x²=x²-4x+4
I=a²-ab+ba-b² = a²-b²
et J =(x+6) (x+6) =x²+6x+6x+36=x²+12x+36
