Completing the Square by Boxed Rockets

Solve Using Completing the Square.

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

x = 6 \pm 3 \sqrt{5}

x^{2} - 14 x + 8 = 0

x = 7 \pm \sqrt{41}

x^{2} - 16 x - 7 = 0

x = 8 \pm \sqrt{71}

x^{2} + 8 x + 4 = 0

x = -4 \pm 2 \sqrt{3}

x^{2} - 14 x + 10 = 0

x = 7 \pm \sqrt{39}

x^{2} - 6 x + 7 = 0

x = 3 \pm \sqrt{2}