Question

Test?
$4 \sqrt{(81) { - }^{2} }$
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Answer 1

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$4 \sqrt{(81) { - }^{2} }$

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$➪ \sqrt[4]{ {(81)}^{ - 2} }$

$➪ { ({ (\frac{1}{81}) }^{2}) }^{ \frac{1}{4} }$

$➪ {( {( \frac{1}{ {9}^{2} } )}^{2} )}^{ \frac{1}{4} } = { (\frac{1}{ {9}^{2} } )}^{ \frac{1}{2} } = { ({ \frac{1}{9} )}^{2} }^{ \frac{1}{2} } = \frac{1}{9}$

$➪ \frac{1}{9} \: answer$

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