Réponses

2014-01-06T18:33:23+01:00
A(x)=(-2x+1)(3x-4)
=-6x²+8x+3x-4
=-6x²+11x-4

B(x)=(2x-5)²
=4x²-20x+25

C(x)=(-3x+7)²
=9x²-42x+49

D(x)=(x-2)²+3(x-2)
=x²-4x+4+3x-6
=x²-x-2

E(x)=(x-1)(-2x+4)+(x-1)(x-5)
=-2x²+4x+2x-4+x²-5x-x+5
=-x²+1