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1. $x + y = 5, x + 4 y = 4,$

Answer: Option D

Explanation:

দেওয়া আছে, x + y = 5 x + 4 y = 4 . : 4 x^{2} + 20 xy + 16 y^{2} = 4 x^{2} + 4 xy + 16 xy + 16 y^{2} = 4 x (x + y) + 16 y (x + y) = (x + y) (4 x + 16 y) = 4 (x + y) (x + 4 y) = 4.5.4 = 80

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