Answers

2014-04-19T17:31:30+05:30
Subracting (a+b)^2  from both sides

(a+b)^2 = 0

therefore

a+b = 0

therfore 

a=-b

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2014-04-19T17:48:11+05:30
2(a+b)^2-(a+b)^2=0
(a+b)^2=0
a+b=0
a=-b
if a=b
then a=b=0
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