\(x^{2} + 9x - 3 = 0\)
\(x^{2} + 9x = 3\)
\((\dfrac{9}{2})^{2} = \dfrac{81}{4} \)
\(x^{2} + 9x + \dfrac{81}{4} = 3 + \dfrac{81}{4} \)
\((x + \dfrac{9}{2})^{2} = \dfrac{93}{4}\)
\(\sqrt{(x + \dfrac{9}{2})^{2}} = \sqrt{\dfrac{93}{4}}\)
\(x + \dfrac{9}{2} = \pm \dfrac{\sqrt{93}}{2}\)
