Q. 335.0( 5 Votes )

If x13 y7 = (x + y)20, prove that

Answer :

Here,


x13 y7 = (x + y)20


Taking log on both sides,



13 log x+7log y = 20 log(x+y)


[ Since, log (AB)=logA+logB ; log =b log a]


Differentiating it with respect to x using the chain rule,











Hence, Proved.


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