Réponses

2013-10-10T16:24:06+02:00
A = 2+4(x+4)²=2+4(x²+8x+16)=2+4x²+32x+64=4x²+32x+66
B = 3x-5(2x+4)²=3x-5(4x²+16x+16)=3x-20x²-80x-80=-20x²-77x-80
C = 3x+2(4x-1)(2x+5)=3x+2(8x²+20x-2x-5)=3x+16x²+40x-4x-10=16x²+39x-10
D = 2x+(4x-5)(4x-5)=2x+(16x²-20x-20x+25)=2x+16x²-40x+25=16x²-38x+25