Mathematics for IGCSE & O level - Equations (Section 7 - No. 14)

Which of the following is a key step in solving a quadratic equation by factoring?

Using the quadratic formula.

Finding two numbers whose sum is 'c' and product is 'b'.

Finding two numbers whose sum is 'b' and product is 'c'.

Completing the square.

Correctly identifying the factors is fundamental to the process.