Answers

2014-06-04T17:51:53+08:00
(a + b)(a + b) = a^2 + 2ab + b^2
(a - b)(a - b) = a^2 - 2ab + b^2
(a + b)(a - b) = a^2 - b^2
(a + b)(a^2 - ab + b^2) = a^3 + b^3
(a - b)(a^2 + ab + b^2) = a^3 - b^3

hope this helps :)
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