Sudarshan posted an Question
April 09, 2020 • 17:59 pm 30 points
  • IIT JAM
  • Physics (PH)

What should be the value of a such that the straight line x+y=awill be a tangent to the circle x+y = 42 ( 1 (b) 2 (c) 2/2 (d) 4

What should be the value of a such that the straight line x+y=awill be a tangent to the circle x+y = 42 ( 1 (B) 2 (C) 2/2 (D) 4

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    Ujjawal vishal best-answer

    substitute y = a-x in equation of circle.... it will become quadratic in x and if line touches circle (tangent)/then quadratic equation should have only one root..for this equate discriminant (b^2-4ac) of quadratic equation to 0.

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