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2014-07-01T11:43:39+08:00

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QUADRATIC FORMULA : x =  \frac{-b ± \sqrt{b^{2} -4ac}}{2a}

a = 1
b = 2
c = -4

x = \frac{-2 ± \sqrt{2^{2} -4(1)(-4)}}{2(1)}

x = \frac{-2 ± \sqrt{20}}{2}

x = \frac{-2 ± 2\sqrt{5}}{2}

\boxed{x = -1 ± \sqrt{5}}
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Please disregard those A's. I don't know how to remove them