UPSC NDA I 2016 Mathematics Solved Paper

For the next three (3) items that follow :
Consider a parallelogram whose vertices are A(1,2),B(4,y),C(x,6) and D(3,5) taken in order.

[NDA I 2016]

Question : 58 of 120

Marks: +1, -0

What is the value of AC2−BD2 ?

[NDA I 2016]

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