x^2 + 3x -1 = 0
[tex]x=\frac{-3+\sqrt{13}}{2}\\\\\:x=\frac{-3-\sqrt{13}}{2}[/tex]
x^2 + 2x - 3 = 0
x= 1
x= -3
x^2 - 2x - 3 = 0
x = 3
x = -1
x^2 - x + 3 = 0
[tex]x=\frac{1}{2}+i\frac{\sqrt{11}}{2}\\\\\:x=\frac{1}{2}-i\frac{\sqrt{11}}{2}[/tex]
Letra c) x^2 - 2x - 3 = 0
