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lim x → 1 √ 5 x − 4 − √ x x − 1 - Mathematics

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Question

\[\lim_{x \to 1} \frac{\sqrt{5x - 4} - \sqrt{x}}{x - 1}\] 

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Solution

\[\lim_{x \to 1} \left[ \frac{\sqrt{5x - 4} - \sqrt{x}}{x - 1} \right]\] It is of the form\[\frac{0}{0} .\] 

Rationalising the numerator: 

\[\lim_{x \to 1} \left[ \left( \frac{\sqrt{5x - 4} - \sqrt{x}}{x - 1} \right)\left( \frac{\sqrt{5x - 4} + \sqrt{x}}{\sqrt{5x - 4} + \sqrt{x}} \right) \right]\]

=  \[\lim_{x \to 1} \left[ \frac{5x - 4 - x}{\left( x - 1 \right)\left( \sqrt{5x - 4} + \sqrt{x} \right)} \right]\] 

=  \[\frac{4}{\sqrt{5 - 4} + \sqrt{1}}\] 

=\[\frac{4}{2}\]

= 2

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Chapter 29: Limits - Exercise 29.4 [Page 28]

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RD Sharma Mathematics [English] Class 11
Chapter 29 Limits
Exercise 29.4 | Q 8 | Page 28

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