Respostas

2014-05-19T18:21:21-03:00
Usa a formula do delta
Δ=b²-4(a×c)
a=2
b=-10
c=-12
Δ=(-10)²-4(2×-12)
Δ=100+96
Δ=196

x= \frac{-b+/- \sqrt{Δ} }{2a}
x= \frac{-(-10)+/- \sqrt{196} }{2×2}
x= \frac{10+/-14}{4}
x1= \frac{10+14}{4} = \frac{24}{4} =6
x2= \frac{10-14}{4} = \frac{-4}{4} =-1
2014-05-19T18:42:53-03:00