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JEE Mains · Maths · STD 11 - 10.2 parabola,ellipse,hyperbola

यदि \(x^{2}+9 y ^{2}-4 x+3=0, x, y \in R\) हैं, तो \(x\) तथा \(y\) क्रमशः निम्न में से किस अंतराल में है?

  1. A \(\left[-\frac{1}{3}, \frac{1}{3}\right]\) and \(\left[-\frac{1}{3}, \frac{1}{3}\right]\)
  2. B \(\left[-\frac{1}{3}, \frac{1}{3}\right]\) and \([1,3]\)
  3. C \([1,3]\) and \([1,3]\)
  4. D \([1,3]\) and \(\left[-\frac{1}{3}, \frac{1}{3}\right]\)
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Answer & Solution

Correct Answer

(D) \([1,3]\) and \(\left[-\frac{1}{3}, \frac{1}{3}\right]\)

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Detailed explanation

\(x^{2}+9 y^{2}-4 x+3=0\) \(\left(x^{2}-4 x\right)+\left(9 y^{2}\right)+3=0\) \(\left(x^{2}-4 x+4\right)+\left(9 y^{2}\right)+3-4=0\) \((x-2)^{2}+(3 y)^{2}=1\) \(\frac{(x-2)^{2}}{(1)^{2}}+\frac{y^{2}}{\left(\frac{1}{3}\right)^{2}}=1\) (equation of an ellipse). As it is equation…
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