Completing the Square by Boxed Rockets

Write the following in the form ${(x + a)}^{2} + b$

x^{2} - 15 x - 5

{(x - \frac{15}{2})}^{2} - \frac{245}{4}

x^{2} - 7 x + 1

{(x - \frac{7}{2})}^{2} - \frac{45}{4}

x^{2} + 9 x - 10

{(x + \frac{9}{2})}^{2} - \frac{121}{4}

x^{2} + 14 x + 7

{(x + 7)}^{2} - 42

x^{2} + 15 x + 3

{(x + \frac{15}{2})}^{2} - \frac{213}{4}

x^{2} - 9 x - 7

{(x - \frac{9}{2})}^{2} - \frac{109}{4}