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Lim X → ∞ | X | X is Equal to

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Question

\[\lim_{x \to \infty} \frac{\left| x \right|}{x}\]  is equal to 

Options

  •  1     

  • −1         

  •  0     

  •  does not exist 

MCQ
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Solution

We know that, 

\[\left| x \right| = \begin{cases}x, & if x \geq 0 \\ - x, & if x < 0\end{cases}\]
\[ \therefore \frac{\left| x \right|}{x} = \begin{cases}\frac{x}{x}, & if x \geq 0 \\ \frac{- x}{x}, & if x < 0\end{cases} = \begin{cases}1, & if x \geq 0 \\ - 1, & if x < 0\end{cases}\]
Now, for all  0 (however, x may large be),  

\[\frac{\left| x \right|}{x} = 1\] 

\[\therefore \lim_{x \to \infty} \frac{\left| x \right|}{x} = 1\] 

Hence, the correct answer is option (a).

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Chapter 29: Limits - Exercise 29.13 [Page 81]

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R.D. Sharma Mathematics [English] Class 11
Chapter 29 Limits
Exercise 29.13 | Q 40 | Page 81

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