Multiple Choice Questions on If a and b are the roots of the equation x2 9x 20 0 find the value of a2 b2 ab ........ for Mathematics - All Exams Preparation

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Multiple Choice Questions

If a and b are the roots of the equation x2 9x 20 0 find the value of a2 b2 ab ........

Quantitative Aptitude ( CCS) Algebra
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    If a and b are the roots of the equation x2 - 9x + 20 = 0, find the value of a2 + b2 + ab?

    60

    Incorrect Answer

    61

    Correct Answer

    63

    Incorrect Answer

    55

    Incorrect Answer
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    Explanation:

    a2 + b2 + ab = a2 + b2 + 2ab - ab
    i.e., (a + b)2 - ab
    from x2 - 9x + 20 = 0, we have
    a + b = 9 and ab = 20. Hence the value of required expression (9)2 - 20 = 61.

    By: MIRZA SADDAM HUSSAIN
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