Simplify Radical

[greatwhiteshark]

(sqrt5*cube root9)^2

MY WORK:

(sqrt5*cube9) (sqrt5*cube root9)

sqrt25*cube root81

My problem is simplifying cube root 81. Where do I go from here?

 

[pka]

<SUP>3</SUP>√(81)=3(<SUP>3</SUP>√(3))

 

[greatwhiteshark]

Hey

can you please tell me how you got to the answer step by step?

 

[Denis]

cubrt(81) = cubrt(27 * 3) ... OK? ; a bit like sqrt(20) = sqrt(4 * 5)

 

[greatwhiteshark]

ok

Got it.

 

[imnerd]

is the answer 15(3^1/3)?