exam Maths Puzzle Numerical Ability

x(m+n)+y(m+n)

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hey, can you help me? there is a proof question on my geometry worksheet.

given: B is the midpoint of line segment AC.
prove: AB+CD=BD
proof:
Statments: Reasons I would like help in finding this equation in standard form, the directrix, the p, the focus and what y would equal. I would also like a graph of the parabola to see what it would