Resposta :
Δ = (5²) - 4 . 2 . (- 7)
Δ = 25 + 56
Δ = 81
-----
x' = - 5 + 9 / 4
4 / 4 =
x' = 1
-----
x'' = - 5 - 9 / 4
- 14 / 4 =
x'' = - 7 / 2
S = (1, -7/2)
Δ = 25 + 56
Δ = 81
-----
x' = - 5 + 9 / 4
4 / 4 =
x' = 1
-----
x'' = - 5 - 9 / 4
- 14 / 4 =
x'' = - 7 / 2
S = (1, -7/2)