Question 323084
((sqrt 11 - sqrt 7)/(sqrt 11 + sqrt 7))
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Multiply numerator and dinominator by (sqrt(11)-sqrt(7)) to get:
((sqrt 11 - sqrt 7))^2/(11-7)
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= [11 + 7 - 2sqrt(77)]/4
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= [18 -2sqrt(77)]/4
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= [9 - sqrt(77)]/2
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Cheers,
Stan H.