Mathematics for IGCSE & O level - Algebraic Manipulation (Section 5 - No. 3)

What is the next step after factoring out the common factor of 3 from 3x² - 12?

Complete the square

Apply the difference of squares to the remaining terms

Find two numbers that add up to -4 and multiply to 0

Use the quadratic formula

The remaining expression x² - 4 can be factored using the difference of squares