\( (z + \frac83)^3 = z^3 + 3\cdot\frac83z^2 + 3\cdot\frac649z + \frac51227 = z^3 + 8z^2 + \frac1929z + \frac51227 = z^3 + 8z^2 + \frac643z + \frac51227 \) - Groen Casting