Respostas

2014-05-15T10:05:03-03:00
2x=15-x²
x²+2x-15=0
D=(2)²-4.(1).(-15)
D=4+60 = 64
x= -(2) +-8
        2.(1)
x¹=-2+8/2 = 6/2 = 3
x²=-2-8/2 = -10/2 = -5

14 4 14