Answers

2014-02-26T14:01:30+05:30
4x^2-2x(a+b)-2x(a-b)+(a^2-b^2)=0
2x(2x-a+b)-(a-b)(2x-a+b)=0
(2x-a+b)^2=0
2x=a-b;
x=(a-b)/2 ans 
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we could also use shree dhsra charya rule also.....