QUADRATIC FORMULA : [tex]x = \frac{-b ± \sqrt{b^{2} -4ac}}{2a}[/tex]
a = 1
b = 2
c = -4
[tex]x = \frac{-2 ± \sqrt{2^{2} -4(1)(-4)}}{2(1)}[/tex]
[tex]x = \frac{-2 ± \sqrt{20}}{2}[/tex]
[tex]x = \frac{-2 ± 2\sqrt{5}}{2}[/tex]
[tex]\boxed{x = -1 ± \sqrt{5}}[/tex]
