Question

if
$if \: {a}^{2} + \frac{1}{ {a}^{2} } = 27 \: then \: value \: of \: a - \frac{1}{a \: } \: is$
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Answer 1

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Answer 2

$\huge\bf\mathfrak{Answer}$
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by using the formula of::
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(a-b)² = a²+b ²-2ab
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$(a -\frac{1}{a}) {}^{2} = a {}^{2} + (\frac{1}{a}) {}^{2} - 2 \\ \\ = > (a -\frac{1}{a}) {}^{2} = 27 - 2 \\ \\ = > (a -\frac{1}{a}) {}^{2} = 25 \\ \\ = > (a -\frac{1}{a}) {}^{} = 5$
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