Respostas

2014-02-10T21:19:54-02:00
Δ = b² - 4.a.c
Δ = 9 - 4. 2. -5
Δ = 9 +40
Δ = 49


x = - b ±√Δ / 2a
x = - 3 ± 7 / 4

x = - 3 + 7 / 4
x = 4 / 4
x = 1

y = - 3 - 7 / 4
y = - 10 / 4
y = - 5 / 2