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

यदि वक्र \(C: 2 x^2-y+1=0, C\) के बिंदु \((1,3)\) पर स्पर्श रेखा \(x+y=1\) से घिरे, प्रथम चतुर्थांश में, क्षेत्र का क्षेत्रफल \(\mathrm{A}\) है, तो \(60 \mathrm{~A}\) बराबर है

  1. A \(16\)
  2. B \(14\)
  3. C \(12\)
  4. D \(10\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(16\)

Step-by-step Solution

Detailed explanation

\(y=2 x^2+1\) Tangent at \((1,3)\) \(y =4 x -1\) \(A =\int \limits_0^1\left(2 x ^2+1\right) dx \text {-area of }(\Delta QOT )-\text { area of }\) \((\Delta PQR )+\text { area of }(\Delta QRS )\) \(A =\left(\frac{2}{3}+1\right)-\frac{1}{2}-\frac{9}{8}+\frac{9}{40}=\frac{16}{60}\)
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