287 x 287 + 269 x 269 – 2 x 287 x 269 = ?

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Question:
287 x 287 + 269 x 269 – 2 x 287 x 269 = ?

[A].

534

[B].

446

[C].

354

[D].

324

Answer: Option D

Explanation:

Given Exp. = a2 + b2 – 2ab, where a = 287 and b = 269
= (a – b)2 = (287 – 269)2
= (182)
= 324