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1. $f : R \to R, f (x) = 2 x + 1$

Answer: Option B

Explanation:

ধরি, y = f (x) = 2 x + 1 এখন,y=f (x) {∴x=f}^{- 1} (y) প্রদত্ত রাশি, y=2x+1 \Rightarrow 2 x + 1 = y \Rightarrow 2 x = y - 1 \Rightarrow x = \frac{y - 1}{2} \Rightarrow f^{- 1} (y) = \frac{y - 1}{2} তাহলে, f^{- 1} (2) = \frac{2 - 1}{2} = \frac{1}{2}

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