Question

$( {3a + \frac{1}{3a} })^{2}$
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Answer 1

$( {3a + \frac{1}{3a} })^{2}$

$(a + b)^{2} = {a}^{2} + 2ab + {b}^{2} \\ \\ \\ {(3a)}^{2} + 2(3a)( \frac{1}{3a} ) + \frac{1}{(3a) ^{2} } \\ \\ \\ {9a}^{2} + 2 + \frac{1}{ {9a}^{2} }$