Question

In A PQR , PD perpendicular to QR such that D lies on QR. If PQ=a, PR=b,QD=C and DR=d and a, b, c, d are positive integers prove that (a+b) (a-b) = (c+d) (c-d)


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Answer 1

Answer:

Use Pythagoras theorem on both the triangles and the subtract the equations formed. You will get the answer