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MHT CET202123 Sep 2021Evening ShiftMathematicsPair of LinesActual

If two lines represented by a x^2+2 h x y+b^2=0 makes angles and with positive direction of X -axis, then ( + )=

Options

  1. A2 h b-a
  2. B2 h a-b
  3. Ch a+b
  4. D2 h a+b

Correct answer

B. 2 h a-b

Step-by-step solution

We have + = -2 ~h ~b and = a b aligned & ( + )= + 1- & = ( -2 h b ) 1- ( a b ) = -2 h b b b-a = 2 h a-b aligned

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