Question

span data-sheets-value="{"1":2,"2":"If y = 5 + 2√6, then the value of √y - (1/√y)"}" data-sheets-userformat="{"2":513,"3":{"1":0},"12":0}">If x = 10 + 2√21, then the value of √x - (1/√x)?

A 2√6
B 2√7
C 5√7
D 7√6
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