Question 1130740
{{{root(3,-216x^10y^21)}}}
= {{{root(3,(-6)^3*x*x^9*y^21)}}}
= {{{root(3,(-6)^3*x^9*y^21)*(root(3,x))}}}
= {{{-6x^3*y^7*root(3,x))}}}