JEE Main & Advanced Mathematics Complex Numbers and Quadratic Equations Question Bank Solution of quadratic equations and Nature of roots

  • question_answer
    The roots of \[|x-2{{|}^{2}}+|x-2|-6=0\]are  [UPSEAT 2003]

    A) 0, 4

    B) -1, 3

    C) 4, 2

    D) 5, 1

    Correct Answer: A

    Solution :

    When \[x<2,\] \[{{(x-2)}^{2}}-(x-2)-6=0\] \[\Rightarrow {{x}^{2}}-4x+4-x+2-6=0\]\[\Rightarrow \] \[{{x}^{2}}-5x=0\] \[\Rightarrow \] \[x(x-5)=0\] \[\Rightarrow \] \[x=0\] When\[x\ge 2\];  \[{{(x-2)}^{2}}+(x-2)\,-6=0\] \[\Rightarrow {{x}^{2}}-4x+4+x-2-6=0\] \[\Rightarrow \] \[{{x}^{2}}-3x-4=0\] \[\Rightarrow \] \[{{x}^{2}}-4x+x-4=0\] \[\Rightarrow \] \[(x-4)(x+1)=0\]  \[\Rightarrow \] \[x=4\].


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