x 6x 55 How is the equation solved by completing the square Select the correct choice below and if necessary fill in the answer box es within your choice O A Use the formula x 2 b b 4ac 2a with a b and c OB Add to both sides and factor the left side as a perfect square Then take the square root and isolate x 2 OC Write the equation in the form x p by subtracting from both sides and then take the square root OD Set the equation equal to 0 and factor the nonzero side of the equation Set each factor equal to 0 and solve