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Limx→1(x-1)(2x-3)2x2+x-3 is ______. - Mathematics

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Question

`lim_(x -> 1) ((sqrt(x) - 1)(2x - 3))/(2x^2 + x - 3)` is ______.

Options

  • `1/10`

  • `(-1)/10`

  • 1

  • None of these

MCQ
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Solution

`lim_(x -> 1) ((sqrt(x) - 1)(2x - 3))/(2x^2 + x - 3)` is `(-1)/10`.

Explanation:

Given `lim_(x -> 1) ((sqrt(x) - 1)(2x - 3))/(2x^2 + 3x - 2x - 3)`

= `lim_(x -> 1) ((sqrt(x) - 1)(2x - 3))/(x(2x + 3) - 1(2x + 3))`

= `lim_(x -> 1)((sqrt(x) - 1)(2x - 3))/((x - 1)(2x + 3))`

= `lim_(x -> 1) ((sqrt(x) - 1)(sqrt(x) + 1)(2x - 3))/((x - 1)(sqrt(x) + 1)(2x + 3))`

= `lim_(x + 1) ((x - 1)(2x - 3))/((x - 1)(sqrt(x) + 1)(2x + 3))`

= `lim_(x -> 1) (2x - 3)/((sqrt(x) + 1)(2x + 3))`

Taking limit we have

= `(2(1) - 3)/((sqrt(1) + 1)(2 xx 1 + 3))`

= `(-1)/(2 xx 5)`

= `(-1)/10`

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Chapter 13: Limits and Derivatives - Exercise [Page 243]

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NCERT Exemplar Mathematics [English] Class 11
Chapter 13 Limits and Derivatives
Exercise | Q 62 | Page 243

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