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1. $x^{2} + y^{2} = 25$

Answer: Option B

Explanation:

দেওয়া আছে - x^{2} + y^{2} = 25 এবং xy = 12 {(x + y)}^{2} = x^{2} + 2 xy + y^{2} = x^{2} + y^{2} + 2 xy = 25 + 2.12 = 25 + 24 {(x + y)}^{2} = 49 x + y = 7

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