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Lim X → 0 √ 1 + X + X 2 − √ X + 1 2 X 2 - Mathematics

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प्रश्न

\[\lim_{x \to 0} \frac{\sqrt{1 + x + x^2} - \sqrt{x + 1}}{2 x^2}\] 

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उत्तर

\[\lim_{x \to 0} \left[ \frac{\sqrt{1 + x + x^2} - \sqrt{x + 1}}{2 x^2} \right]\] It is of the form \[\frac{0}{0}\] 

Rationalising the numerator: 

\[\lim_{x \to 0} \left[ \frac{\left( \sqrt{1 + x + x^2} - \sqrt{x + 1} \right)\left( \sqrt{1 + x + x^2} + \sqrt{x + 1} \right)}{\left( \sqrt{1 + x + x^2} + \sqrt{x + 1} \right)2 x^2} \right]\] 

= \[\lim_{x \to 0} \left[ \frac{\left( 1 + x + x^2 \right) - \left( x + 1 \right)}{\left( \sqrt{1 + x + x^2} + \sqrt{x + 1} \right)2 x^2} \right]\]

= \[\lim_{x \to 0} \left[ \frac{x^2}{\left( \sqrt{1 + x + x^2} + \sqrt{x + 1} \right)\left( 2 x^2 \right)} \right]\]

=  \[\frac{1}{\left( \sqrt{1 + 0 + 0} + \sqrt{0 + 1} \right) \times 2}\] 

= \[\frac{1}{2} \times \frac{1}{2}\] 

= \[\frac{1}{4}\] 

  

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पाठ 29: Limits - Exercise 29.4 [पृष्ठ २९]

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आरडी शर्मा Mathematics [English] Class 11
पाठ 29 Limits
Exercise 29.4 | Q 22 | पृष्ठ २९

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