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JEE Mains · Maths · STD 12 - 8. Application and integration

क्षेत्र \(\left\{( x , y ) \in R ^{2} \mid 4 x ^{2} \leq y \leq 8 x +12\right)\) का क्षेत्रफल (वर्ग इकाइयों में) है

  1. A \(\frac{127}{3}\)
  2. B \(\frac{125}{3}\)
  3. C \(\frac{124}{3}\)
  4. D \(\frac{128}{3}\)
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Answer & Solution

Correct Answer

(D) \(\frac{128}{3}\)

Step-by-step Solution

Detailed explanation

\(4 x^{2}-y \leq 0\) and \(8 x-y+12 \geq 0\) On solving \(y=4 x^{2}\) and \(\quad y=8 x+12\) We get \(A(-1,4)\;and\; B(3,36)\) Required area \(=\) area of the shaded region \(=\int_{-1}^{3}\left(8 x+12-4 x^{2}\right) d x=\frac{128}{3}\)
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