Pls what’s the answer

Proving the parallelogram diagonal theoremgiven abcd is a parralelogam, diagnals ac and bd intersect at eprove ae is conruent to ce and be is congruent to de

Write as a product: ac^2–ad+c^3–cd–bc^2+bd

Heather is riding a quadratic function that represents a parabola that touches but does not cross the x-axis at x=-6