The simplified radical expression is 27y[tex]\sqrt{15}[/tex].
What is radical expression?
The radical expression is "form of n √a, where 'n' is called index, 'a' is called radicand, and √ is called radical"
According to the question,
√(15y) * 3√(81)y
= 3 √(15)(81)y²
= 3 × y × √(1215)
= 3 × y × √(3×3×3×3×3×5)
= 3 × y ×9√15
=27y√15
Hence, The simplified radical expression is 27y[tex]\sqrt{15}[/tex].
Learn more about radical expression here
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