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[tex] \frac{2 - \sqrt{5} }{ \sqrt{7 \: } } = \: \frac{2 - \sqrt{5} }{ \sqrt{7} } \times \frac{ \sqrt{7} }{ \sqrt{7} } \: \: \: \: \: \: = \frac{2( \sqrt{7)} \times - \sqrt{5( \sqrt{7)} } }{ \sqrt{7} \times \sqrt{7} } = \: \frac{2 \sqrt{7} - \sqrt{35} }{7} [/tex]
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Answer:
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[tex] \frac{2 - \sqrt{5} }{ \sqrt{7 \: } } = \: \frac{2 - \sqrt{5} }{ \sqrt{7} } \times \frac{ \sqrt{7} }{ \sqrt{7} } \: \: \: \: \: \: = \frac{2( \sqrt{7)} \times - \sqrt{5( \sqrt{7)} } }{ \sqrt{7} \times \sqrt{7} } = \: \frac{2 \sqrt{7} - \sqrt{35} }{7} [/tex]
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