Multiple Choice Questions on if a and b are the roots of the equation X 2 9X 20 0 find the value of ........... for CDS Exam Preparation

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Multiple Choice Questions

if a and b are the roots of the equation X 2 9X 20 0 find the value of ...........

Quantitative Aptitude (CDS) Quadratic Equations
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    if a and b are the roots of the equation    X^2- 9X+ 20= 0 find the value of                   a^2 + b^2+ ab?

     

    -21
     

    Incorrect Answer

    11
     

    Incorrect Answer

    61
     

    Correct Answer

    21

    Incorrect Answer
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    Explanation:

    a^2 + b^2+ ab=a^2 + b^2+2ab-ab
    i.e ,(a+b)^2-ab
    From X^2- 9X+ 20= 0
    we have   a+b=9 and ab=20
     Hence the value of required expression 9^2-20=61

    By: bhavesh kumar singh
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