How to find the partial fractions for this expression?

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SUMMARY

The discussion centers on finding the partial fractions for the expression \(((n+1)(\sqrt{n}) - n(\sqrt{n+1})) / (n(n+1))\). The correct final answer is established as \(1/\sqrt{n} - 1/\sqrt{n+1}\). The user attempted to solve for coefficients A and B using the method of partial fractions but encountered issues leading to both coefficients being zero. A key insight provided is that the expression does not require partial fractions but rather simplification into separate terms.

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ybhathena
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Homework Statement



Find the partial fractions for this expression.

(((n+1)*(sqrt(n)) - n*(sqrt(n+1))) / (n*(n+1)))

The Attempt at a Solution



The final answer is 1/sqrt(n) - 1/(sqrt(n+1))

My work:

A/n - B/(n+1) = n*sqrt(n+1) - (n+1)*(sqrt(n))
I am subbing in n = -1 and n = 0 to solve for A and B which usually works but in this case it is giving me A = 0 and B = 0, which means I am getting 0 as my partial fraction. Thank you for your help.
 
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ybhathena said:

Homework Statement



Find the partial fractions for this expression.

(((n+1)*(sqrt(n)) - n*(sqrt(n+1))) / (n*(n+1)))

The Attempt at a Solution



The final answer is 1/sqrt(n) - 1/(sqrt(n+1))

My work:

A/n - B/(n+1) = n*sqrt(n+1) - (n+1)*(sqrt(n))
I am subbing in n = -1 and n = 0 to solve for A and B which usually works but in this case it is giving me A = 0 and B = 0, which means I am getting 0 as my partial fraction. Thank you for your help.

Your expression doesn't require partial fractions, it requires re-writing as [tex] \frac{(n+1)\sqrt{n} - n\sqrt{n+1}}{n(n+1)} = \frac{(n+1)\sqrt{n}}{n(n+1)} -\frac{n\sqrt{n+1}}{n(n+1)}[/tex] and further simplifications in each term.
 
Thank you very much !
 

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