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JEE Main 202313 AprilEvening Shift
Exam
JEE Main
Year
2023
Date
13 April
Shift
Evening Shift
Subject
Mathematics
Chapter
Hyperbola

JEE Main 2023 · 13 April · Evening Shift · Mathematics · Hyperbola

The foci of a hyperbola are ( ± 2, 0 ) and its eccentricity is...

The foci of a hyperbola are (±2,0)( \pm 2, 0 ) and its eccentricity is 32\dfrac{3}{2}. A tangent, perpendicular to the line 2x+3y=62x + 3y = 6, is drawn at a point in the first quadrant on the hyperbola. If the intercepts made by the tangent on the xx- and yy-axes are aa and bb respectively, then ∣6a∣+∣5b∣| 6a | + | 5b | is equal to

Correct answer

0

Step-by-step solution

The given equation of hyperbola is x2a2−y2b2=1,ae=2,e=32\dfrac{{x}^{2}}{{a}^{2}} - \dfrac{{y}^{2}}{{b}^{2}} = 1, ae = 2, e = \dfrac{3}{2}

⇒a=43⇒ a = \dfrac{4}{3}

⇒b2=a2e2−a2=4−169=209⇒ {b}^{2} = {a}^{2}{e}^{2} - {a}^{2} = 4 - \dfrac{16}{9} = \dfrac{20}{9}

The tangent is perpendicular to 2x+3y=62x + 3y = 6.

Slope of tangent is m=−1−23=32m = \dfrac{- 1}{\dfrac{- 2}{3}} = \dfrac{3}{2}

Equation of tangent, m=32m = \dfrac{3}{2}

Equation of tangent is y=mx−a2m2−b2y = mx - \sqrt{{a}^{2}{m}^{2} - {b}^{2}}
⇒y=32x−169×94−209⇒ y = \dfrac{3}{2}x - \sqrt{\dfrac{16}{9} \times \dfrac{9}{4} - \dfrac{20}{9}}

( ∵∵ Tangent is in 1st{1}^{\text{st}} quadrant\left⇒ C < 0\right)</p><p></p><p>⇒ y = \dfrac{3}{2}x - \dfrac{4}{3}</p><p>Convertingtheequationintointerceptform:</p><p></p><p>Converting the equation into intercept form:</p><p>⇒ \dfrac{x}{\left(\dfrac{8}{9}\right)} + \dfrac{y}{\left(- \dfrac{4}{3}\right)} = 1</p><p></p><p>⇒ \left|6a\right| + \left|5b\right| = \left|\dfrac{6 \times 8}{9}\right| + \left|\dfrac{5 \times \left(- 4\right)}{3}\right| = 12

Hence this is the required option.

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