Simplify the following equation for n 1

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SUMMARY

The equation \(\frac{1}{(n-1)^2} - \frac{1}{n^2}\) simplifies to approximately \(\frac{2}{n^3}\) when \(n\) is significantly larger than 1 (i.e., \(n >> 1\)). The initial attempt to combine the fractions resulted in \(\frac{-n^2 + 3n - 1}{n^3 - 2n^2 + n}\), but the correct approach involves recognizing the second term as \(\frac{1}{n^2}\) instead of \(\frac{1}{n}\). This correction leads to the accurate simplification of the expression.

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Homework Statement


show \frac{1}{(n-1)^2} - \frac{1}{n^2} about= \frac{2}{n^3}
n >> 1

Homework Equations


The Attempt at a Solution


The first thing I tried was to put the expression all into one term.
so I got \frac{-n^2 + 3n - 1}{n^3 - 2n^2 + n}
Unfortunately, I'm not sure where to go next with this... I assume it has to do with n >> 1. But I really don't see how they get 2/n^3 if anything I would think -1/n ...
 
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How did you get your expression (in "attempt at a solution" section)? Did you try to get a common denominator?
 


Wait, I see your problem.

The 2nd term in the original expression is 1/n2, not 1/n
 


My apologies, I just realized I did the incorrect substitution from the original problem. I incorrectly transcribed 1/n. It should have been 1/n^2.

I figured it out now, thanks.
 

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