Tuesday, January 4, 2011

Quadratic expansion

(a + b) 2 = a 2 + b2 + 2ab 
(a - b) 2 = a 2 + b2 -2ab
(a+b)(a-b) = a2 - b2

Example 
(3a-4)(3a+4) 
=32a2 -42
=9a2 - 16
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