Răspunsuri

2014-05-10T16:05:08+03:00
E(x)= [(2x+1)-(2x+1)][(2x+1)+(2x+1)]
=(2x+1-2x-1)(2x+1+2x+1)
=0*(4x+2)=0

E(-1)=0* [(-1)*4+2]=0
2014-05-10T16:06:40+03:00
A) (-2+1)²-2(-1-1)=-1²-2·(-2)=1+4=5
b) 4x²+4x+1-2x+2=4x²+2x+3