Respostas

2013-08-15T21:39:21-03:00
(x+4)²-1=0
(x+4).(x+4)-1=0
x²+4x+4x+16-1=0
x²+8x+15=0

Delta= 8²-4.1.15
Delta=64-60
Delta=4

x= -8+/-V4 /2.1
x'= -8+2/2
x'=-3

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