Completing the Square by Boxed Rockets

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

x^{2} + 4 x - 3

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

x^{2} - 10 x - 9

{(x - 5)}^{2} - 34

x^{2} + 15 x + 4

{(x + \frac{15}{2})}^{2} - \frac{209}{4}

x^{2} + 6 x + 6

{(x + 3)}^{2} - 3

x^{2} + 9 x + 8

{(x + \frac{9}{2})}^{2} - \frac{49}{4}

x^{2} - 9 x + 5

{(x - \frac{9}{2})}^{2} - \frac{61}{4}