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lim x → 3 x 4 − 81 x 2 − 9 - Mathematics

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Question

\[\lim_{x \to 3} \frac{x^4 - 81}{x^2 - 9}\] 

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Solution

\[\lim_{x \to 3} \left[ \frac{x^4 - 81}{x^2 - 9} \right]\]
\[\text{ It is of the form } \frac{0}{0} . \]
\[ \lim_{x \to 3} \left[ \frac{\left( x^2 \right)^2 - 9^2}{x^2 - 9} \right]\]
\[ = \lim_{x \to 3} \left[ \frac{\left( x^2 - 9 \right)\left( x^2 + 9 \right)}{x^2 - 9} \right]\]
\[ = \lim_{x \to 3} \left( x^2 + 9 \right)\]
\[ = 3^2 + 9\]
\[ = 18\]

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Chapter 29: Limits - Exercise 29.3 [Page 23]

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RD Sharma Mathematics [English] Class 11
Chapter 29 Limits
Exercise 29.3 | Q 3 | Page 23

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