Respostas

2014-04-01T23:07:00-03:00
X²+x=12
x²+x-12=0
Δ=b²-4.a.c
a=1,b=1 , c=-12
Δ=1-4.1.-12
Δ=1+48
Δ=49

x1=( -b+√Δ):2.a
x1=(-1+7):2=
x1=6:2=3
x1=3

x2=( -b-√Δ):2.a
x2=(-1-7):2=
x2=-8:2=-4
x2=-4

s=(-4, 3)
2 3 2