Completing the Square by Boxed Rockets

Solve Using Completing the Square.

x^{2} + 8 x + 3 = 0

x = -4 \pm \sqrt{13}

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

x = 4 \pm 2 \sqrt{6}

x^{2} + 14 x - 5 = 0

x = -7 \pm 3 \sqrt{6}

x^{2} - 10 x - 5 = 0

x = 5 \pm \sqrt{30}

x^{2} + 16 x + 4 = 0

x = -8 \pm 2 \sqrt{15}

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

x = 5 \pm \sqrt{23}