Answers

2014-06-02T19:44:29+08:00
(a+b)(a-b) = a²-b²
(a+b)² = a² + 2ab + b²
(a+b)³ = a³ + 3a²b + 3ab² + b³
(a-b)(a²+ab+b²) = a³ - b³
(a+b)(a²-ab+b²) =a³ + b³ 

these are some special products in factoring
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