Respostas

2013-12-10T04:40:20-02:00
2x² + 5x = 3
2x
² + 5x - 3 = 0
Δ = 25 - 4 . 2 . - 3
Δ = 25 + 24
Δ = 49
x = - 5 + - 7 / 4
x = - 12 / 4
                               x = - 3
x = - 5 + 7 / 4
                               x =  3 / 4

2013-12-10T10:10:50-02:00
2x² + 5x = 3
4x+5x=3
9x=3
x=3\9
x=3