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Lim X → 0 a X + B X − 2 X

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Question

\[\lim_{x \to 0} \frac{a^x + b^x - 2}{x}\]

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Solution

\[\lim_{x \to 0} \left[ \frac{a^x + b^x - 2}{x} \right]\]
\[ = \lim_{x \to 0} \left[ \frac{a^x - 1 + b^x - 1}{x} \right]\]
\[ = \lim_{x \to 0} \left[ \frac{a^x - 1}{x} \right] + \lim_{x \to 0} \left[ \frac{b^x - 1}{x} \right]\]
\[ = \log a + \log b\]
\[ = \log \left( ab \right)\]

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Chapter 29: Limits - Exercise 29.1 [Page 71]

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R.D. Sharma Mathematics [English] Class 11
Chapter 29 Limits
Exercise 29.1 | Q 5 | Page 71

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