Mathematics for IGCSE & O level - Algebraic Manipulation (Section 4 - No. 32)
Consider the expression 2x² + 4x - 6. What is the first step to factor this expression?
Factor out the common factor of 2.
Find two numbers that multiply to -6 and add to 4.
Use the quadratic formula.
Complete the square.
Explication
The expression can be simplified by factoring out the common factor 2.