Question Bank • QB_EM_102 NAT • 2 Marks

Section 1: Engineering Mathematics

Calculus

Subtopic: Limit, continuity and differentiability

Question Statement:

Evaluate the limit: $L = \lim_{x \to 0} (1 + 2x)^{1/x}$

Answer Key:

7.389

Step-by-Step Solution & Explanation

This is of indeterminate form $1^\infty$. $\ln L = \lim_{x \to 0} \frac{\ln(1 + 2x)}{x}$ Applying L'Hopital's rule: $\ln L = \lim_{x \to 0} \frac{\frac{2}{1 + 2x}}{1} = 2$ $L = e^2 \approx 7.389$
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