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Most Important Selected Qs for JEE AdvancedMathematicsParabola

Paragraph: Tangent to the parabola y=x^2+a x+1 , at the point of intersection of y -axis also touches the circle x^2+y^2=r^2 . Also no point of the parabola is below x -axis Question: The radius of circle when a attains its maximum value

Options

  1. A1 10
  2. B1 5
  3. C1
  4. D5

Correct answer

B. 1 5

Step-by-step solution

Since, parabola is above x -axis D=a^2-4 0 Thus, a _ =2

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