Answers

2016-07-18T19:03:48+08:00
(a-b-2)²  is maybe equal to a^2+b^2+4
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2016-07-18T19:47:12+08:00
This is an example of squaring a trinomial so, : 
 
               (a-b-2)^2=a^2+b^2-4a+4b-2ab+4
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