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

यदि परवलय \(y^{2}=12x\) पर स्थित बिंदुओं \(P_{1}(x_{1},y_{1})\) और \(P_{2}(x_{2},y_{2})\) को जोड़ने वाली जीवा परवलय के शीर्ष पर समकोण अंतरित करती है, तो \(x_{1}x_{2}-y_{1}y_{2}\) = ___ है।

  1. A 288
  2. B 280
  3. C 284
  4. D 292
Verified Solution

Answer & Solution

Correct Answer

(A) 288

Step-by-step Solution

Detailed explanation

\(\left( x _1 y _1\right)=\left(3 t _1^2, 6 t _1\right) \&\left( x _2 y _2\right)=\left(3 t _2^2, 6 t _2\right)\) \(t _1 t _2=-4\) \(\begin{array}{l}x_1 x_2=9\left(t_1 t_2\right)^2, y_1 y_2=36 t_1 t_2 \\ x_1 x_2-y_1 y_2=9(16)-36(-4)\end{array}\)…
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