Răspunsuri

2014-08-27T14:42:21+03:00
2*(x+1)²-3*(x-2)(x+2)+5x*(x-3)-(3x-1)²=
=2*(x²+2x+1)-3(x²-4)+5x²-15x-(9x²-6x+1)
=2x²+4x+2-3x²+12+5x²-15x-9x²+6x-1
=2x²-3x²+5x²-9x²+4x-15x+6x+2+12-1
=-5x²-5x+13