Let the tangent drawn to the parabola y 2 = 24 x at the point α , β is perpendicular to the line 2…

Let the tangent drawn to the parabola y2=24x at the point α,β is perpendicular to the line 2x+2y=5. Then the normal to the hyperbola x2α2-y2β2=1 at the point α+4,β+4 does NOT pass through the point:
  1. 25,10
  2. 20,12
  3. 30,8
  4. 15,13

Solution

Given, the tangent drawn to the parabola y2=24x at the point α,β is perpendicular to the line 2x+2y=5.

So, tangent at α,β has slope 1

And α,β lies on y2=24x so β2=24α

Equation of tangent will be yβ=12x+α so its slope will be 12β=1, so β=12

α=6,β=12

  α+4,β+4=10,16

Now finding normal at 10,16 to x236-y2144=1,

First finding slope of the tangent 2x36-2y144dydx=0

dydx10,16=144×1036×16=52, so slope of the normal will be -25

Now equation of normal will be y-16=-25x-10

2x+5y=100

Now satisfying all option one by one we can see 15,13 will not satisfy the given line.

Asked in: JEE Main 2022 (26 Jul Shift 1)

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