You can put this solution on YOUR website! Simplify the radicals:
3√81y^17
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I'm going to assume you want the cube root of (81y^17)
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cbrt(81y^17)
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= cbrt(27y^15*3y^2)
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= cbrt(27y^15)*cbrt(3y^2)
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= 3y^5*cbrt(3y^2)
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Cheers,
Stan H.