Respostas

2014-02-26T09:05:26-03:00
Δ= b²-4.a.c
Δ= 9²-4.1.8
Δ=81-32
Δ=49

x= -b+/-√Δ
       2.a
x= -9+7 /2
x¹= -2/2
x¹= - 1

x² = -9-7/2
x² =-16/2
x² = -8

S={-8,-1}