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Director
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If n is positive, which of the following is equal to [#permalink]
 09 May 2006, 01:05
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If n is positive, which of the following is equal to 1/{sqrt(n+1)-sqrt(n)}?
A. 1.
B. sqrt(2n+1)
C. sqrt(n+1)/sqrt(n)
D. sqrt(n+1)-sqrt(n)
E. sqrt(n+1)+sqrt(n)
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Director
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MUltiplying both nominator and denominator with E yields E as an answer
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Director
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Yes get E.
This is in the form
1/(a-b)
Multiply num and denom by (a+b)
So we get (a+b)/(a^2 - b^2)
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