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1. $a + \frac{1}{a} = 5$

Answer: Option C

Explanation:

a + \frac{1}{a} = 5 \Rightarrow \frac{a^{2} + 1}{a} = 5 \Rightarrow a^{2} + 1 = 5 a \frac{a}{a^{2} + a + 1} = \frac{a}{a^{2} + 1 + a} = \frac{a}{5 a + a} = \frac{a}{6 a} = \frac{1}{6}

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