As shown in the figure, in the plane rectangular coordinate system, the image of quadratic function y = x + BX + C intersects with X axis and points a and B, point a is on the left side of the far point, the coordinate of point B is (3,0), intersects with y axis and points c (0, - 3), and point P is a moving point on the parabola below the straight line BC 1. Find the expression of this quadratic function 2. Connect Po and PC, and fold △ POC along CO to get quadrilateral pop ˊ C. is there a point P to make quadrilateral pop ˊ C diamond?

As shown in the figure, in the plane rectangular coordinate system, the image of quadratic function y = x + BX + C intersects with X axis and points a and B, point a is on the left side of the far point, the coordinate of point B is (3,0), intersects with y axis and points c (0, - 3), and point P is a moving point on the parabola below the straight line BC 1. Find the expression of this quadratic function 2. Connect Po and PC, and fold △ POC along CO to get quadrilateral pop ˊ C. is there a point P to make quadrilateral pop ˊ C diamond?

Substituting A.C