Solve the quadratic equation by completing the square: $\displaystyle {x}^{{2}}+{12}{x}+{10}={28}$ 

Give the equation after completing the square, but before taking the square root. Your answer should look like: $\displaystyle {\left({x}-{a}\right)}^{{2}}={b}$ 
The equation is:  Preview Question 6 Part 1 of 2  

List all solutions to the equation, separated by commas. The solutions are: 

$\displaystyle {x}=$  Preview Question 6 Part 2 of 2