Factoring Special Cases ALGEBRA 1 LESSON 9-7 Factor 5x2 – 80. 5x2 – 80 = 5(x2 – 16) Factor out the GCF of 5. = 5(x + 4)(x – 4) Factor (x2 – 16). Check: Use FOIL to multiply the binomials. Then multiply by the GCF. 5(x + 4)(x – 4) 5(x2 – 16) 5x2 – 80 5-11
Factoring Special Cases ALGEBRA 1 LESSON 9-7 Factor each expression. 1. y2 – 18y + 81 2. 9a2 – 24a + 16 3. p2 – 169 4. 36x2 – 225 5. 5m2 – 45 6. 2c2 + 20c + 50 (y – 9)2 (3a – 4)2 (p + 13)(p – 13) (6x + 15)(6x – 15) 5(m + 3)(m – 3) 2(c + 5)2 5-11