Respostas

2013-10-01T17:37:54-03:00
A)3 x^{2} +12                    b)10y-2 y^{2}
c) x^{2} -2xy+2xy-4 y^{2}         d)25+10a+ a^{2}
e) x^{2} +8x+15              f) x^{2} +5x-14