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1. $5^{x} + 8 . 5^{x} + 16 . 5^{x} = 1$

Answer: Option C

Explanation:

দেওয়া আছে, 5^{x} {+8×5}^{x} {+16×5}^{x} =1 \Rightarrow 5^{x} (1 + 8 + 16) = 1 \Rightarrow 5^{x} \times 25 = 1 \Rightarrow 5^{x} = \frac{1}{25} \Rightarrow 5^{x} = (\frac{1}{5^{2}}) \Rightarrow 5^{x} = 5^{- 2} ∴ x = - 2

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