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JEE Mains · Maths · STD 12 - 6. Application of derivatives

वक्र \(y = x ^3+3 x ^2+5\) के बिन्दु \(\left( x _1, y _1\right)\) पर खींची गई स्पर्श रेखा मूलबिन्दु से गुजरती है, तो बिन्दु \(\left( x _1, y _1\right)\) किस वक्र पर स्थित नहीं है:

  1. A \(x^{2}+\frac{y^{2}}{81}=2\)
  2. B \(\frac{ y ^{2}}{9}- x ^{2}=8\)
  3. C \(y=4 x^{2}+5\)
  4. D \(\frac{x}{3}-y^{2}=2\)
Verified Solution

Answer & Solution

Correct Answer

(D) \(\frac{x}{3}-y^{2}=2\)

Step-by-step Solution

Detailed explanation

The tangent at \(\left(x_{1}, y_{1}\right)\) to the curve \(y=x^{3}+3 x^{2}+5\) \(y-y_{1}=\left(3 x_{1}^{2}+6 x_{1}\right)\left(x-x_{1}\right) \text { passing through origin }\) \(-y_{1}=\left(3 x_{1}^{3}+6 x_{1}\right)\left(-x_{1}\right)\)…
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