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JEE Mains · Maths · STD 12 - 7.2 definite integral

माना \(f( x )\) तथा \(g ( x )\) दो फलन हैं, जो \(f\left( x ^{2}\right)+ g (4- x )=4 x ^{3}\) तथा \(g (4- x )+ g ( x )=0\) को संतुष्ट करते हैं। तो \(\int \limits_{1}^{4} f( x )^{2} dx\) का मान है ........ |

  1. A \(373\)
  2. B \(496\)
  3. C \(584\)
  4. D \(512\)
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Answer & Solution

Correct Answer

(D) \(512\)

Step-by-step Solution

Detailed explanation

\(I =2 \int_{0}^{4} f\left( x ^{2}\right) dx \{\) Even funtion \(\}\) \(=2 \int_{0}^{4}\left(4 x ^{3}- g (4- x )\right) d x\) \(=2\left(\left.\frac{4 x ^{4}}{4}\right|_{0} ^{4}-\int_{0}^{4} g (4- x ) d x \right)\) \(=2(256-0)=512\)
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