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2014-07-21T21:30:17-03:00
x^2 + x-12= 0 \\  \\ a = 1 \\  \\ b= 1 \\  \\ c = -12 \\  \\

Δ = b² - 4 *a *c
Δ= 1 ²- 4*1*(-12)
Δ= 1 +48
Δ= 49
1 5 1
2014-07-21T21:37:29-03:00
Delta = 1^2-4•1•-12
Delta = 1+48
Delta = 49