11-15: Rearrange the following steps in solving quadratic equation by completing the square. Write letter A for the first step, letter B for the second step and so on. 11. Add the square of one half of the coefficient of x on both sides of the resulting equation. The left side of the equation becomes a perfect square trinomial. 12. Divide both sides of the equation by a then simplify, 13. Express the perfect square trinomial on the left side of the equation as a square of binomial. 14. Solve the resulting equation by extracting the square root. 15. Write the equations such that the terms with variable are on the left side of the equation and the constant term is on the right side.​