Respostas

2014-05-22T11:30:24-03:00
A- completa
b- completa
c- incompleta
d- completa
2014-05-22T11:40:14-03:00
Δ=b2-4ac
Δ=(-7)2-4(1)(10)
Δ=49+40
Δ=9
x=-b+-√Δ/2a
x=7+-3/2
x'=10/2=5
x''=4/2=2
s=5,2