English

P Lim X → ∞ 5 X 3 − 6 √ 9 + 4 X 6

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Question

\[\lim_{x \to \infty} \frac{5 x^3 - 6}{\sqrt{9 + 4 x^6}}\]

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Solution

\[\lim_{x \to \infty} \left[ \frac{5 x^3 - 6}{\sqrt{9 + 4 x^6}} \right]\]
\[\text{ Dividing the numerator and the denominator by } x: \]
\[ \lim_{x \to \infty} \left[ \frac{\frac{5 x^3 - 6}{x^3}}{\frac{\sqrt{9 + 4 x^6}}{x^3}} \right]\]
\[ = \lim_{x \to \infty} \left[ \frac{5 - \frac{6}{x^3}}{\sqrt{\frac{9}{x^6} + 4}} \right]\]
\[ = \frac{5}{\sqrt{4}}\]
\[ = \frac{5}{2}\]

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Chapter 29: Limits - Exercise 29.6 [Page 38]

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R.D. Sharma Mathematics [English] Class 11
Chapter 29 Limits
Exercise 29.6 | Q 3 | Page 38

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