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JEE Main 202226 JulyMorning Shift
Exam
JEE Main
Year
2022
Date
26 July
Shift
Morning Shift
Subject
Mathematics
Chapter
Hyperbola

JEE Main 2022 · 26 July · Morning Shift · Mathematics · Hyperbola

Let the tangent drawn to the parabola y ^ 2 = 24x at the point (α,...

Let the tangent drawn to the parabola y2=24x{y}^{2} = 24x at the point \left(\alpha, \beta\right)isperpendiculartothelineis perpendicular to the line2x + 2y = 5.Thenthenormaltothehyperbola. Then the normal to the hyperbola\dfrac{{x}^{2}}{{\alpha}^{2}} - \dfrac{{y}^{2}}{{\beta}^{2}} = 1atthepoint(α+4,β+4)at the point \left(\alpha + 4, \beta + 4\right) does NOT pass through the point:

Options

  1. A(25,10)\left(25, 10\right)
  2. B(20,12)\left(20, 12\right)
  3. C(30,8)\left(30, 8\right)
  4. D(15,13)\left(15, 13\right)

Correct answer

D. (15,13)\left(15, 13\right)

Step-by-step solution

Given, the tangent drawn to the parabola y2=24x{y}^{2} = 24x at the point \left(\alpha, \beta\right)isperpendiculartothelineis perpendicular to the line2x + 2y = 5.</p><p>So,tangentat(α,β).</p><p>So, tangent at \left(\alpha, \beta\right) has slope 11

And \left(\alpha, \beta\right)liesonlies on{y}^{2} = 24xsoso{\beta}^{2} = 24\alpha</p><p>Equationoftangentwillbe</p><p>Equation of tangent will bey\beta = 12 \left(x + \alpha\right) so its slope will be \dfrac{12}{\beta} =11, so β=12\beta = 12

⇒α=6,β=12⇒ \alpha = 6, \beta = 12

∴(α+4,β+4)∴ \left(\alpha + 4, \beta + 4\right) = \left(10, 16\right)</p><p>Nowfindingnormalat(10,16)</p><p>Now finding normal at \left(10, 16\right) to x236−y2144=1\dfrac{{x}^{2}}{36} - \dfrac{{y}^{2}}{144} = 1,

First finding slope of the tangent 2x36−2y144dydx=\dfrac{2x}{36} - \dfrac{2y}{144}\dfrac{dy}{dx} =0</p><p></p><p>⇒ {\left(\dfrac{dy}{dx}\right)}_{\left(10, 16\right)} = \dfrac{144 \times 10}{36 \times 16} = \dfrac{5}{2},soslopeofso slope ofthe normal will be\dfrac{- 2}{5}</p><p>Nowequationofnormalwillbe</p><p>Now equation of normal will bey - 16 = \dfrac{- 2}{5}\left(x - 10\right)</p><p></p><p>⇒ 2x + 5y = 100</p><p>Nowsatisfyingalloptiononebyonewecansee(15,13)</p><p>Now satisfying all option one by one we can see \left(15, 13\right) will not satisfy the given line.

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