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1. $9 x^{2} = 6 x - 2$

Answer: Option D

Explanation:

দেওয়া আছে, 9 x^{2} = 6 x - 2 \Rightarrow 9 x^{2} + 2 = 6 x \frac{\Rightarrow 9 x^{2} + 2}{3 x} = \frac{6 x}{3 x} \Rightarrow 3 x + \frac{2}{3 x} = 2 এখন, \frac{81 x^{4} + 4}{9 x^{2}} = \frac{81 x^{4}}{9 x^{2}} + \frac{4}{9 x^{2}} = 9 x^{2} + \frac{4}{9 x^{2}} = {(3 x)}^{2} + {(\frac{2}{3 x})}^{2} = {(3 x + \frac{2}{3 x})}^{2} - 2 \times 3 x \times \frac{2}{3 x} = 2^{2} - 4 = 4 - 4 = 0

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