(c - z)(c^2 + cz + z^2)
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It can't be factored because its discriminant is less than zero.
4x cubed y cubed z divided by x negative squared y negative 1 z sqaured = 4
(z-9)(z+3
Using the quadratic formula you get z≅4.91547594742265 or z≅-0.91547594742265
z = 5