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Lim X → 4 2 − √ X 4 − X - Mathematics

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Question

\[\lim_{x \to 4} \frac{2 - \sqrt{x}}{4 - x}\]

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Solution

\[\lim_{x \to 4} \left[ \frac{2 - \sqrt{x}}{4 - x} \right]\]

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

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

= \[\frac{1}{2 + \sqrt{4}}\]

= \[\frac{1}{2 + 2}\] 

=  \[\frac{1}{4}\]

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Chapter 29: Limits - Exercise 29.4 [Page 29]

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RD Sharma Mathematics [English] Class 11
Chapter 29 Limits
Exercise 29.4 | Q 23 | Page 29

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