CEE Kerala Engineering CEE Kerala Engineering Solved Paper-2004

  • question_answer
    The quadratic equation in\[x\]such that the arithmetic mean of its roots is 5 and geometric mean of the roots is 4, is given by:

    A)  \[{{x}^{2}}+20x+16=0\]

    B)  \[{{x}^{2}}-10x+16=0\]

    C)  \[{{x}^{2}}+10x+16=0\]

    D)  \[{{x}^{2}}-10x-16=0\]

    E)  \[{{x}^{2}}+20x+32=0\]

    Correct Answer: B

    Solution :

    Let\[\alpha \]and\[\beta \]be the roots of equation. Then, \[\alpha +\beta =10,\text{ }\alpha \text{ }\beta =16\] \[\therefore \]Required equation is \[{{x}^{2}}-(\alpha +\beta )x+\alpha \text{ }\beta =0\] \[\Rightarrow \]               \[{{x}^{2}}-10x+16=0\]


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