simplify the expression z^2-z(z+3)+3z
z^2-z(z+3)+3zz^2 - z^2 - 3z + 3z0 + 00z^2-z(z+3)+3z = 0
\(z^2-z(z+3)+3z\) \(z^2-z^2-3z+3z\) \(-3z+3z\) \(0\) \(\text{Solution}\)
