Respostas

2014-06-29T15:43:13-03:00
4x²+12x+5=0
Δ=b²-4.a.c
=12²-4.4.5
=144-80
=64

x'=-b+
√Δ/2.a
x''=-b-√Δ/2.a

x'=-12+√64/2.4
x'=-12+8/8
x'=-4/8
x'=-0,5

x''=-12-√64/2.4
x''=-12-8/8
x''=-20/8
x''=-2,5