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10th Class Mathematics Polynomials Question Bank MCQs - Polynomials

  • question_answer
    The value of k for which 3 is a zero of polynomial \[2{{x}^{2}}+x+k\]is ............

    A) 21

    B) 20

    C) -21

    D) 18

    Correct Answer: C

    Solution :

    Given, 3 is a zero of polynomial  \[2{{x}^{2}}+x+k\]
     Let      \[f\left( x \right)=2{{x}^{2}}+x+k\]
                \[f\left( 3 \right)=0\]
                \[0=2{{\left( 3 \right)}^{2}}+3+k\]
                \[k\text{ }=-\left( 18\text{ }+3 \right)\]
                \[k=-21\]
     


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