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## Factoring Review

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**Factoring Review**25 January 2011**Factoring**• The process of rewriting an equation or expression as the product of its factors • Example: x2 + 3x + 2 = (x + 2)(x + 1) • Most common form is the quadratic form: ax2 + bx + c, a ≠ 0**Factoring (when a = 1)**ax2 + bx + c = (x + ___ ) (x + ___ ) multiply to equal c and add up to equal b You can always check your answer by FOIL-ing!**Finding Factors of C**• Identify the value of c • On your calculator, go to the y= screen • Type C/X into y1 • Go to the table • Any whole numbers (positive, non-decimal numbers) in the y1 column are factors of c**Your Turn:**• Complete problems 1 – 4 on the “Factoring Practice” handout • Check your answer by FOIL-ing!**Difference of Squares**• When we use it: • Usually in the form ax2 – c • Both a and c are perfect squares (the square root of each number is a whole number)**Your Turn:**• Complete problems 5 – 10 on the “Factoring Practice” handout • Remember to check your answer by FOIL-ing!**Factoring (when a ≠ 1):The Welsh Method Pt. I**• Multiply c and a • Rewrite the expression with the new value for c • Write (ax + )(ax + ) • Finish “factoring” the new expression • Reduce each set of parentheses by any common factors**Your Turn:**• Complete problems 11 – 20 on the “Factoring Practice” handout • Don’t forget to check by FOIL-ing!**GCF (Greatest Common Factor)**• When we use it: when the all the terms share 1 or more factors • Factoring out GCFs save us time!!!**GCF (Greatest Common Factor)**• Steps: • Identify any common factor(s) (including the GCF) • Factor out the common factor(s) • Factor the remaining expression if possible**Your Turn:**• Complete problems 1 – 10 on “Functions Practice Pt. II” handout**GCFs and The Welsh Method**Make sure you factor out any GCFs or the Welsh Method doesn’t work!!!**Your Turn:**• Complete problems 11 – 22 on the “Factoring Practice Part II” handout