Completing the Square by Boxed Rockets

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

x^{2} + 7 x + 2

{(x + \frac{7}{2})}^{2} - \frac{41}{4}

x^{2} - 15 x - 1

{(x - \frac{15}{2})}^{2} - \frac{229}{4}

x^{2} + 8 x - 5

{(x + 4)}^{2} - 21

x^{2} - 14 x - 8

{(x - 7)}^{2} - 57

x^{2} + 3 x + 10

{(x + \frac{3}{2})}^{2} + \frac{31}{4}

x^{2} - 8 x - 5

{(x - 4)}^{2} - 21