Mathematics for IGCSE & O level - Algebraic Manipulation (Section 2 - No. 48)
What is the correct strategy to factor an expression like ax² + bx + c when 'a' is not equal to 1?
Always use the difference of squares.
Look for a GCF.
Use trial and error or factoring by grouping.
Use only completing the square.
Explication
Use trial and error and factoring by grouping.