Mathematics for IGCSE & O level - Algebraic Manipulation (Section 1 - No. 21)

How do you find the value to add inside the parenthesis to complete the square in x² + bx + c?

Multiply c by 2.

Divide b by 2 and square the result.

Multiply b and c.

Subtract b from c.

The process involves taking half of the coefficient of the x term (b/2) and squaring the result.