Question 68829
{{{cuberoot(64a^6b^15c^3) }}}.

64*6*15 = 64 * 90, Right?
        = 4^3 * 90
a^6 = a*a*a*a*a*a
    = a^3 * a^3
    = (a^3)^2
b^15 = b*b*b*b*b*b*b*b*b*b*b*b*b*b*b
      = b^3*b^3*b^3*b^3*b^3
      = (b^3)^5
c^3 = c*c*c
    = c^3

<br> 
{{{4a^2b^5c (cuberootof 90)}}}