Help please i beg for help please What is the standard form for the quadratic function?

f(x)=(x−3)2+5

f(x)=x2+14

f(x)=x2+6x−4

f(x)=x2−4

f(x)=x2−6x+14

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.