Quadratic Formula by Boxed Rockets

Use the Quadratic Formula to Solve with Surds.

x^{2} - 9 x - 6 = 0

x = \frac{9 \pm \sqrt{105}}{2}

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

x = \frac{-7 \pm \sqrt{77}}{2}

x^{2} - x - 4 = 0

x = \frac{1 \pm \sqrt{17}}{2}

x^{2} + 3 x - 4 = 0

x = 1 or -4

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

x = -1 \pm 2 \sqrt{2}

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

x = \frac{7 \pm \sqrt{77}}{2}