Verified Answer :

apologiabiology

remember
\(\sqrt{xyz}=( \sqrt{x} )( \sqrt{y} )( \sqrt{z})\)
4\(\sqrt{81x^(20)y^8}\)=
4\(=( \sqrt{81} )( \sqrt{x^{20}} )( \sqrt{y^8})\)=
4\(=(9)( x^{10} )( y^{4})\)=
36x¹⁶y⁴

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