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1. $4 x^{2} - 3 x - 1 = 0$

Answer: Option D

Explanation:

{দেওয়া আছে, 4x}^{2} -3x -1 = 0 ধরি, মূলদ্বয় a , b এখানে, a + b = − \frac{( − 3 )}{4} = \frac{3}{4} a b= − \frac{1}{4} {এখন, ( a − b )}^{2} {= ( a + b )}^{2} − 4 a b = (\frac{3}{4})^{2} − 4 × \frac{-1}{4} = \frac{25}{16} সুতরাং, a − b = \frac{5}{4}

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