JEE Main & Advanced Mathematics Rectangular Cartesian Coordinates Question Bank Transformation of axes and Locus

  • question_answer
    The equation of the locus of a point whose distance from (a, 0) is equal to its distance from y-axis, is [MP PET 1986]

    A) \[{{y}^{2}}-2ax={{a}^{2}}\]

    B) \[{{y}^{2}}-2ax+{{a}^{2}}=0\]

    C) \[{{y}^{2}}+2ax+{{a}^{2}}=0\]

    D) \[{{y}^{2}}+2ax={{a}^{2}}\]

    Correct Answer: B

    Solution :

    Let the point be \[(h,\,\,k),\,\] So,\[{{(h-a)}^{2}}+{{(k-0)}^{2}}={{h}^{2}}\]\[\Rightarrow \,\,\,{{h}^{2}}+{{a}^{2}}-2ah+{{k}^{2}}={{h}^{2}}\] Hence locus is\[{{y}^{2}}-2ax+{{a}^{2}}=0\].


You need to login to perform this action.
You will be redirected in 3 sec spinner