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

  • question_answer
    The flow of the water in the pool is represented by \[{{x}^{2}}-2x-8,\] then its zeroes are:

    A) \[2,-4\]

    B) \[4,-2\]

    C) \[2,-2\]

    D) \[-4,-4\]

    Correct Answer: B

    Solution :

    We have,
    For the zeroes of \[f(x),\]
    \[x-4=0\] or \[x+2=0\]
                \[\therefore \,\,\,\,\,\,\,\,\,x=4,-2\]
                [\[8=2\times 4=8\times 1\]
    \[\therefore \]We will take 2 and 4 as a factors of 8.
    So, middle term is \[-2=-4+2\]]
    So, option [b] is correct.     

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