This process will help you, try it
The process of completing the square includes the construction of a perfect square from the members of the equation that contains the variable of the equation.
Consider the equation - 9x^{2} - bx = 0
The method of completing the square will include the given steps
i. Make the coefficient of x2 unity
ii. Add the square of ½ the coefficient of x to with both sides of the equivalent sign. The left hand side is still a perfect square
iii. Factorize the perfect square on the left hand side.
iv. Determine the square root of both sides
v. Solve for x.