Respostas

2014-05-23T19:54:40-03:00
Delta= b²-4.a.c
delta=2²-4.1.(-15)
delta=4+60
delta=64

x=-b+-raiz de delta /2.a
x=-2 +-raiz de 64/2.1
x=-2+-8/2

x'=-2+8/2
x'=6/2
x'=3

x''=-2-8/2
x"=-10/2
x"=-5

resposta= {3;-5}