Mathematics for IGCSE & O level - Algebraic Manipulation (Section 6 - No. 45)
When factorizing 3x² - 6x - 9, which is the correct step to start with?
Find two numbers that multiply to -27 and add to -6.
Look for the common factor.
Split the middle term into two parts.
Use the quadratic formula.
Explication
The first step is to look for common factors that can simplify the expression.