1.

If a4 + 1/a4 = 50, a > 0 ,then find the value of a3 + 1/a3.

A. \(\sqrt {2(1 + \sqrt {13} } ) + \left( { - 1 + 2\sqrt {13} } \right)\)
B. \(\sqrt {2(1 + \sqrt {13} } ) - \left( { - 1 - 2\sqrt {13} } \right)\)
C. \(\sqrt {2(1 + \sqrt {13} } )\left( { - 1 + 2\sqrt {13} } \right)\)
D. \(\sqrt {2(1 - \sqrt {13} } )\left( { - 1 + 2\sqrt {13} } \right)\)
Answer» D. \(\sqrt {2(1 - \sqrt {13} } )\left( { - 1 + 2\sqrt {13} } \right)\)


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