Question 980420

{{{4 + sqrt(x^3+y^3) = z }}}

{{{ sqrt(x^3+y^3) = z -4}}}

{{{(sqrt(x^3+y^3) )^2= (z -4)^2}}}

{{{x^3+y^3= z^2 -8z+16}}}

{{{y^3= -x^3+z^2 -8z+16}}}

{{{y= root(3,-x^3+z^2 -8z+16)}}}