Answer :

exponental law

[tex]( \sqrt{x}) times ( \sqrt{n} )= \sqrt{xn}[/tex] so
√(81y^5)=√81 times √(y^5)
√81=9 or -9
√(y^5)=y^2 times√y
answer is 9y^2 times √y or -9y^2 times √y

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