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10th Class Mathematics Quadratic Equations Question Bank Quadratic Equation

  • question_answer
    Which of the following are the roots of the equation\[{{\left| x \right|}^{2}}+\left| x \right|-12=0\]?
    (i) 1              (ii) - 1             
    (iii) 3                    (iv) - 3
     

    A)  Both (i) and (ii)

    B)  Both (iii) and (iv)

    C)  (i), (ii), (iii) and (iv)        

    D)  None of these

    Correct Answer: B

    Solution :

    (b): (i) Put [x] = y and frame the equation and solve.


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