Find the maximum rate of change of the function f(x,y) = (3 y^5)/x at the point (1,2)(adsbygoogle = window.adsbygoogle || []).push({});

First I took the gradient of f(x,y)=<-3y^5*x^-2,15y^4*x^-1>

and took the pt <1/sqrt(5),2/sqrt(5)>

Then <-3y^5*x^-2,15y^4*x^-1>*<1/sqrt(5),2/sqrt(5)>

the answer i get is 171.73

I'm not sure where my error is

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# Find the maximum rate of change

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