"The equation: z4-2z3+2z2-10z+25 = 0 has the roots z = 2+i and z = -1-2i. Solve the equation completely."
judging by the questions being asked here I don't supose people know the answer to this question right?
Complex roots of polynomial equations occur as conjugate pairs, so the other two roots will be 2 - i and -1 + 2i.
Tiggsy
