Respostas

2014-03-23T19:46:57-03:00
[(5x)²+2.5x.2+(2)²]-3[x²+2.4.x+(4)²]-3=
[25x²+20x+4]-3[x²+8x+16]-3=
[25x²+20x+4]-3x²+24x+48-3=
22x²+44x+49