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If `sqrt(x)+(58)/(sqrt(x))` =31 then which of the following can be the value of x?

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If `sqrt(x)+(58)/(sqrt(x))` =31 then which of the following can be the value of x?
A. 529
B. 931
C. 729
D. 841
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Correct Answer - d
`sqrt(x)+(58)/(sqrt(x))=31`
Since 31 is an integer `(588)/(sqrt(x))` must be an integer
`therefore sqrt(x)` can be 29 or 2 `rarr` x =841 or 4
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