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If $\;\sqrt{19-4 \sqrt{x}}=\sqrt{12} - \sqrt{7}\;$ , then $\;x=$

$(a)\;84\qquad(b)\;28\qquad(c)\;21\qquad(d)\;14$

1 Answer

Answer : $\;21$
If $\;\sqrt{19-4 \sqrt{x}}=\sqrt{12} - \sqrt{7}\;$
Then x = 21
answered Apr 13, 2014 by yamini.v
 
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