Partial Derivatives

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RSADancinQueen

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Aug 5, 2009
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Ok...so I'm convinced that I don't understand partial derivative problems to save my life. The problems that I need to do are:
Find the first partial derivatives of:
f(x,y)=(4y)/(x^2)

f(x,y)=2xln(2y)+2ylnx

f(x,y,z)=xe^(-y/z)

For all of these problems, I don't even know where to start. I read it all up in my book and I see where I need to "use the x as a constant" and "use the y as a constant," but that doesn't make any sense to me. Does anyone know how I can easily walk through these problems? Because I'm totally lost!
Thanks!!
 
RSADancinQueen said:
Ok...so I'm convinced that I don't understand partial derivative problems to save my life. The problems that I need to do are:
Find the first partial derivatives of:
f(x,y)=(4y)/(x^2)

If you were given (where C is a constant)
f(x) = 4C/x[sup:2qiw9xe3]2[/sup:2qiw9xe3] - can you find df/dx?

If you were given (where C is a constant)
f(y) = 4/C[sup:2qiw9xe3]2[/sup:2qiw9xe3] * y - can you find df/dy?

f(x,y)=2xln(2y)+2ylnx

f(x,y,z)=xe^(-y/z)

For all of these problems, I don't even know where to start. I read it all up in my book and I see where I need to "use the x as a constant" and "use the y as a constant," but that doesn't make any sense to me. Does anyone know how I can easily walk through these problems? Because I'm totally lost!
Thanks!!
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