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Lim X → ∞ [ X 4 + 7 X 3 + 46 X + a X 4 + 6 ] Where a is a Non-zero Real Number.

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Question

\[\lim_{x \to \infty} \left[ \frac{x^4 + 7 x^3 + 46x + a}{x^4 + 6} \right]\] where a is a non-zero real number. 

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Solution

\[\lim_{x \to \infty} \left[ \frac{x^4 + 7 x^3 + 46x + a}{x^4 + 6} \right]\] Dividing the numerator and the denominator by x4:  

\[\lim_{x \to \infty} \left[ \frac{1 + \frac{7}{x} + \frac{46}{x^2} + \frac{9}{x^4}}{1 + \frac{6}{x^4}} \right]\]
\[\text{ As } x \to \infty , \frac{1}{x}, \frac{1}{x^2}, \frac{1}{x^3}, \frac{1}{x^4} \to 0\]
\[ = \frac{1}{1}\]

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Chapter 29: Limits - Exercise 29.6 [Page 39]

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R.D. Sharma Mathematics [English] Class 11
Chapter 29 Limits
Exercise 29.6 | Q 20 | Page 39

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