Intergral of (e^(3/x))/(x^2) ?

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SUMMARY

The integral of the function (e^(3/x))/(x^2) can be effectively solved using the substitution method. By letting u = 3/x, the differential du is calculated as -3dx/x^2. This leads to the integral transforming into -1/3 ∫e^u du, which simplifies the process of integration. The discussion confirms that u-substitution is a valid and efficient technique for this type of integral.

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I know how to do a u substitution, but can it be applied to this equation?
 
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u=3/x
du=-3dx/x^2

-1/3 ∫e^u du

etc.
 
ah, thanks
 

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