Multiple Choice Questions on Find the value of lambda such that circle x sup2 y sup2 2x 4y 1 0 touches 3x 4y lambda 0 ........ for CDS Exam Preparation

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Multiple Choice Questions

Find the value of lambda such that circle x sup2 y sup2 2x 4y 1 0 touches 3x 4y lambda 0 ........

Quantitative Aptitude (CDS) Coordinate Geometry
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    Find the value of λ such that circle x²+y²-2x+4y+1=0 touches 3x-4y+ λ=0 .

    -1 & 21

    Incorrect Answer

    1 & -21

    Incorrect Answer

    -1 & -21

    Correct Answer

    1 & 21

    Incorrect Answer
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    Explanation:

    condition for circle x²+y²-2x+4y+1=0 touches 3x-4y+ λ=0  having centre (1, -2) and r = 2
    perpendicular from centre to line L =  R
    Putting values we get λ = -1 & -21

    By: bhavesh kumar singh
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