To solve an equation of the form x2 bx c 0. When we add a term to one side of the equation to make a perfect square trinomial we must also add the same term to the other side of the equation. Make sure that you attach the plus or minus symbol to the constant term right side of equation.
This in essence is the method of completing the square.
Solving by completing the square - Higher Some quadratics cannot be factorised. Solving by completing the square - Higher Some quadratics cannot be factorised. Solving a quadratic equation by completing the square - Higher An alternative method to solve a quadratic equation is to complete the square. It is often convenient to write an algebraic expression as a square plus.