Mathematics for IGCSE & O level - Algebraic Manipulation (Section 4 - No. 45)

In the process of factoring, what does it mean to 'complete the square'?

To factor a perfect square trinomial

To add or subtract a constant to create a perfect square trinomial

To simplify a quadratic expression.

To find the roots of a quadratic expression.

Completing the square is about manipulating an expression to include a perfect square trinomial, and adjusting the constant term accordingly.