Question 137603
4 is a root of {{{x^3-64=0}}} if and only if {{{x-4}}} is a factor of {{{x^3-64}}}.  So, use polynomial long division to divide {{{x^3+0x^2+0x-64}}} by {{{x-4}}}.  The quotient will be a quadratic polynomial.  Find the zeros of the quotient polynomial and you will have your other two zeros of the original function.