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1. $a + \frac{1}{a} = 3$

Answer: Option B

Explanation:

Given, a + 1 / a = 3 বা, {(a + 1 / a)}^{2} = {(3)}^{2} (বর্গ করে) বা, a^{2} + 1 / a^{2} + 2 . a . 1 / a = 9 বা, {(a^{2})}^{2} + {(1 / a^{2})}^{2} + 2 . a^{2} . 1 / a^{2} = 7^{2} a^{4} + 1 / a^{4} = 47

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