2 z - 6*z + 10
z^2 - 6*z + 10
(x + -3 + I)*(x + -3 - I)
(x - 3 + i)*(x - 3 - i)
2 10 + z - 6*z
10 + z^2 - 6*z
10.0 + z^2 - 6.0*z
10 + z*(-6 + z)