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JEE Mains · Maths · STD 11 - 12. limits

यदि \(\lim _{x \rightarrow 1} \frac{x^{2}-a x+b}{x-1}=5\) है, तो \(a+b\) बराबर है 

  1. A \(5\)
  2. B \(1\)
  3. C \(-4\)
  4. D \(-7\)
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Answer & Solution

Correct Answer

(D) \(-7\)

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Detailed explanation

\(\mathop {\lim }\limits_{x \to 1} \frac{{{x^2} - ax + b}}{{x - 1}} = 5\) \(1 - a + b = 0\,\,\,\,\,\,\,.......\left( i \right)\) \(2 - a = 5\,\,\,\,\,\,\,.....\left( {ii} \right)\) \( \Rightarrow a + b = - 7\)
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