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10th Class Mathematics Polynomials Question Bank Case Based MCQs - Polynomials

  • question_answer
    The zeroes of the polynomial \[9{{x}^{2}}-5\] are

    A) \[\frac{3}{\sqrt{5}},\frac{-3}{\sqrt{5}}\]

    B) \[\frac{2}{\sqrt{5}},\frac{-2}{\sqrt{5}}\]

    C) \[\frac{\sqrt{5}}{3},\frac{-\sqrt{5}}{3}\]

    D) \[\frac{\sqrt{5}}{2},\frac{-\sqrt{5}}{2}\]

    Correct Answer: C

    Solution :

    Let be, \[f\left( x \right)=9{{x}^{2}}-5\] \[f\left( x \right)=0\] \[9{{x}^{2}}-5=0\] \[{{x}^{2}}=5/9\] \[x=\pm \sqrt{5/9}=\pm \sqrt{5}/3\]


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