(y 5)2 = + 25 y2 2(5)(y) – – = y2 10y + 25 – Multiply Binomials (Sum and Difference) (a + b)(a b) = a2 b2 – – Examples: (2b + 5)(2b 5) = 4b2 25 – – (7 + = 49 w)(7 w) w2 – –
(y – 5)2 = y2 – 2(5)(y) + 25 = y2 – 10y + 25 Multiply Binomials (Sum and Difference) (a + b)(a – b) = a2 – b2 Examples: (2b + 5)(2b – 5) = 4b2 – 25 (7 – w)(7 + w) = 49 – w2