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1. x + y = 7, xy = 15

  • A. 19
  • B. 19
  • C. 19
  • D. 19

Answer: Option A

Explanation:

দেওয়া আছে , x + y = 7, xy = 15 আমরা জানি, x2 + y2 = (x + y)2 - 2xy = 72 - 2×15 = 49 - 30 = 19

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