Answers

2015-06-24T19:32:15+08:00
It's the formula!

Sol'tn:
(a+b+c)(a+b+c)
   = (a+b+c) ^{2}  =  a^{2} + b ^{2}+ c^{2} +2ab + 2bc+2ac

Always remember that ! Or you can use the foil method. :)
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