As math problem

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Q ] A (7,2) and C (1,4) are two vertices of a square ABCD.
(a) Find the equation of the diagonal BD.
(b) Find the coordinates of B and D.

First part answer is [ 4x -3y = 13 ]
Second part answer is (3,0) and (5,6)

HOW TO WE SOLVE THE SECOND PART
 
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