Resposta :
(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
(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