যদি\(\sqrt {1{\rm{}} + {\rm{\;}}\frac{{72}}{{289}}} {\rm{}} = {\rm{}}\left( {1{\rm{}} + {\rm{}}\frac{{\rm{x}}}{{17}}} \right)\) হয়, তাহলে \(\sqrt {7{{\rm{x}}^2}{\rm{}} + {\rm{}}8}\) এর মান কত হবে?

1
8
2
√15
3
6
4
√(39/4)

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