Răspunsuri

2014-04-15T11:43:09+03:00
(x+2)²=x²+4x+4
(x+3)(x-3)=x²-9
(x-1)²=x²-2x+1

x²+4x+4 /2   -(x²-9)/3=2x-1/2   + x²-2x+1/6    aducem la acelasi numitor
3x²+12x+12-2x²+18=6x-3+x²-2x+1
x²+12x+30=x²+4x-2
12x+30=4x-2
12x-4x=-2-30
8x=-32
x=-4
2014-04-15T11:44:12+03:00