English

Lim X → 0 E B X − E a X X Where 0 < a < B

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Question

\[\lim_{x \to 0} \frac{e^{bx} - e^{ax}}{x} \text{ where } 0 < a < b\] 

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Solution

\[\lim_{x \to 0} \left[ \frac{e^{bx} - e^{ax}}{x} \right]\]
\[ = \lim_{x \to 0} \left[ \left( \frac{e^{bx} - 1}{x} \right) - \left( \frac{e^{ax} - 1}{x} \right) \right]\]
\[ = \lim_{x \to 0} \left[ b\left( \frac{e^{bx} - 1}{bx} \right) - a \times \left( \frac{e^{ax} - 1}{ax} \right) \right]\]
\[ = b \times 1 - a \times 1\]
\[ = b - a\]

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Chapter 29: Limits - Exercise 29.1 [Page 72]

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R.D. Sharma Mathematics [English] Class 11
Chapter 29 Limits
Exercise 29.1 | Q 37 | Page 72

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