Which of the following are the solutions for −x2+4x=13? x=2+3i and x=2−3ix=2+3i and x=2−3i

x=2−3i and −2−3ix=2−3i and −2−3i

x=3+2i and x=−3−2ix=3+2i and x=−3−2i

x=2 and x=−3

If the angle bisectors of a pair of opposite angles of a quadrilateral are the opposite sides of a parallelogram formed by the two angle bisectors and two sides of the quadrilateral, is the quadrilateral always a parallelogram? explain your answer.