Factoring Rules
GCF: Always check for a common factor first.
Difference of Squares: a² − b² = (a − b)(a + b)
Perfect Square Trinomial: a² + 2ab + b² = (a + b)² ; a² − 2ab + b² = (a − b)²
Quadratic (x² + bx + c): Find factors of c that add to b.
Quadratic (ax² + bx + c): Use ac method or trial factors.
Grouping: For four terms, group in pairs and factor out common binomial.
Graph: The red dots show where the polynomial equals zero – the solutions!