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JEE Mains · Maths · STD 12 - 7.2 definite integral

माना \(\mathrm{a}\) तथा \(\mathrm{b}\) वास्तविक अचर इस प्रकार है कि फलन \(f(x)=\left\{\begin{array}{cc}x^2+3 x+a, & x \leq 1 \\ b x+2, & x>1\end{array}, R\right.\) पर अवकलनीय है। तो \(\int_{-2}^2 \mathrm{f}(\mathrm{x}) \mathrm{d} x\) का मान ........... है।

  1. A  \(\frac{15}{6}\)
  2. B \(\frac{19}{6}\)
  3. C  \(21\)
  4. D \(17\)
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Answer & Solution

Correct Answer

(D) \(17\)

Step-by-step Solution

Detailed explanation

\( \mathrm{f} \text { is continuous } \quad \mathrm{f}^{\prime}(\mathrm{x})=2 \mathrm{x}+3, \mathrm{x}<1 \) \( \therefore 4+\mathrm{a}=\mathrm{b}+2\) \( \text { b }, x>1 \) \( \mathrm{a}=\mathrm{b}-2 \quad \mathrm{f} \text { is differentiable } \) \( \therefore \mathrm{b}=5 \)…
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