Question 83881
If {{{ (a + b)^.5 = (a - b)^-.5 }}}, which of the following must be true?
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Rewrite as: 
sqrt(a+b) = 1/sqrt(a-b)
Cross-mutiply to get:
sqrt(a^2-b^2)=1
Square both sides to get:
a^2-b^2 = 1
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Cheers,
Stan H.