Hello people!

Help would be greatly appreciated... z^{3}+ (1 - 4i)z^{2}+ (17 - 16i)z + (-87 - 116i) = 0, where z = 3 + 4i is one of the roots...

step by step working would be fandabadosy too; I know it's pretty basic but I've gone COMPLETELY blank

Cheers!