Multiple Choice Questions on A real number x is such that x x2 is maximum What is x equal to ........ for CDS Exam Preparation

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Multiple Choice Questions

A real number x is such that x x2 is maximum What is x equal to ........

Quantitative Aptitude (CDS) Algebra
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    A real number x is such that (x - x2) is maximum. What is x equal to ?

    -1.5

    Incorrect Answer

    -0.5

    Incorrect Answer

    0.5

    Correct Answer

    1.5

    Incorrect Answer
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    Explanation:

    In aquadratic equation ax2+bx+c, a<0  will be maximum at x=-b/2a
    so  E= -x2+x is a quadratic equation and E will be maximum at x=-1/2(-1)=0.5

    By: Munesh Kumari
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