10th Class Mathematics Polynomials Question Bank MCQs - Polynomials

  • question_answer
    The quadratic polynomial, the sum of whose zeroes is - 5 and their product is 6, is

    A) \[{{x}^{2}}+5x+6\]

    B) \[{{x}^{2}}-5x+6\]

    C) \[{{x}^{2}}-5x-6\]

    D) \[-{{x}^{2}}+5x+6\]

    Correct Answer: A

    Solution :

    Let  \[\alpha\]  and  \[\beta\] are the zeroes of quadratic polynomial
    \[\therefore\]  Sum of zeroes, \[\alpha +\beta =-5\] and product of zeroes,  \[\alpha \beta =6\]                               [given]
    Now, required polynomial
    \[={{x}^{2}}\]- (sum of zeroes) x + product of zeroes
    \[={{x}^{2}}-\left( -5 \right)x+6\]
     \[={{x}^{2}}+5x+6\]
     


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