\(x^{2} + 9x - 4 = 0\)
\(x = \frac{-9 +/- \sqrt{9^{2} - 4(1)(-4)}}{2(1)}\)
\(x = \frac{-9 +/- \sqrt{81 + 16}}{2}\)
\(x = \frac{-9 +/- \sqrt{97}}{2}\)
\(x = \frac{-9 +/- 9.848857802}{2}\)
\(x = \frac{-9 + 9.848857802}{2}\) \(x = \frac{-9 - 9.848857802}{2}\)
\(x = \frac{0.848857802}{2}\) \(x = \frac{-18.848857802}{2}\)
\(x = 0.424428901\) \(x = -9.424428901\)
