Completing the square is a method used to solve quadratic equations that will not factorise.

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Completing the square is a way to solve a quadratic equation if the equation will not factorise.

It is often convenient to write an algebraic expression as a square plus another term. The other term is found by dividing the coefficient of by , and squaring it.

Any quadratic equation can be rearranged so that it can be solved in this way.

When completing the square, we end up with the form: