Examine the diagram, where the secant segment AP

intersects the circle at points A
and B,
and the secant segment CP
intersects the circle at points C
and D.
The lines intersect outside the circle at point P.

A circle, with no center shown, as described in the text. Segment A B equals 5, segment B P equals 7, and segment C P equals 14.What is the length of PD¯¯¯¯¯¯¯¯?
Enter the correct value.