Verified answer

bonjour

a. = x²+3x+5x+15 soit = x²+8x+15

b. = 3x²+12x+2x+4 soit =3x²+14x+4

c. = x² - 2x+3x-6 soit = x²+x-6

d. = x²-x-4x+4 soit = x²-3x+4