Question 51867
U mean cube root of X^2 is equal to 4
      U should type like 
                (X^2)^(1/3) = 4
   cube both side =>     x^2 = 4^3
   square root both side=>     (x^2)^(1/2) = (4^3)^(1/2)
                                 x  = + or - 2^3
                                    = +8 or -8