Question 337658
Rationalize the numerator: 
((sqrt(f+11))-(sqrt(f)))/11
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Multiply numerator and denominator by (sqrt(f+11)+sqrt(f)) to get:
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[(f+11)-f]/[11(sqrt(f+11)+sqrt(f))]
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= [11]/[11(sqrt(f+11)+sqrt(f))]
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= 1/[(sqrt(f+11)+sqrt(f))]
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Cheers,
Stan H.
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