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JEE Mains · Maths · STD 12 - 7.2 definite integral

माना कि द्वितीय चतुर्थांश में वक्र \(x^2=2 y\) और सरल रेखा \(y-2 x-6=0\) का प्रतिच्छेद बिंदु \((a, b)\) है। तो समाकल \(I=\int_a^b \frac{9 x^2}{1+5^x} d x\) = ___

  1. A \(24\)
  2. B \(27\)
  3. C \(18\)
  4. D \(21\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(24\)

Step-by-step Solution

Detailed explanation

\(\begin{aligned} & x^2=2 y\ \&\ y=2 x+6 \\ & x^2=4 x+12\end{aligned}\) \(\left.x^2-4 x-12=0 \Rightarrow \begin{gathered}x=6 \\ y=18\end{gathered} \right\rvert\, \begin{gathered}\text { if } x=-2 \\ y=2\end{gathered}\) \(\therefore(6,18)\ \&\ (-2,2)\) Here \((6,18)\) Rejected…
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