Respostas

2014-03-13T12:08:47-03:00
Δ=b²-4ac
Δ=(-3)²-4.(-1).4
Δ=9+16
Δ=25

x=-b+/-√Δ/2.a
x=-(-3)+/-√25/2.(-1)
x'= 3-5/-2  x'=-2/-2  x'=1
x"=3+5/-2 x"=8/-2  x"=-4

x²-36=0
x²=36
x=√36
x=6