Quadratic Formula by Boxed Rockets

Use the Quadratic Formula to Solve with Surds.

x^{2} + 11 x - 4 = 0

x = \frac{-11 \pm \sqrt{137}}{2}

x^{2} - 14 x + 9 = 0

x = 7 \pm 2 \sqrt{10}

x^{2} - 9 x - 7 = 0

x = \frac{9 \pm \sqrt{109}}{2}

x^{2} - 12 x - 9 = 0

x = 6 \pm 3 \sqrt{5}

x^{2} + 7 x + 7 = 0

x = \frac{-7 \pm \sqrt{21}}{2}

x^{2} + 14 x + 9 = 0

x = -7 \pm 2 \sqrt{10}