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Lim X → 2 ( 1 X − 2 − 4 X 3 − 2 X 2 )

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Question

\[\lim_{x \to 2} \left( \frac{1}{x - 2} - \frac{4}{x^3 - 2 x^2} \right)\] 

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Solution

\[\lim_{x \to 2} \left[ \frac{1}{x - 2} - \frac{4}{x^3 - 2 x^2} \right]\]
\[ = \lim_{x \to 2} \left[ \frac{1}{x - 2} - \frac{4}{x^2 \left( x - 2 \right)} \right]\]
\[ = \lim_{x \to 2} \left[ \frac{x^2 - 4}{x^2 \left( x - 2 \right)} \right]\]
\[ = \lim_{x \to 2} \left[ \frac{\left( x - 2 \right)\left( x + 2 \right)}{x^2 \left( x - 2 \right)} \right]\]
\[ = \lim_{x \to 2} \left[ \frac{x + 2}{x^2} \right]\]
\[ = \frac{2 + 2}{2^2}\]
\[ = 1\]

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Chapter 29: Limits - Exercise 29.1 [Page 23]

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R.D. Sharma Mathematics [English] Class 11
Chapter 29 Limits
Exercise 29.1 | Q 21 | Page 23

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