Multiple Choice Questions on The sum of a number and its square is 20 Then the number is ........ for CDS Exam Preparation

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Multiple Choice Questions

The sum of a number and its square is 20 Then the number is ........

Quantitative Aptitude (CDS) Number System
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    The sum of a number and its square is 20. Then the number is

     - 5 or 4

    Correct Answer

    2 or 3

    Incorrect Answer

    - 5 only

    Incorrect Answer

    5 or - 4

    Incorrect Answer
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    Explanation:

    Let the numbers are x and x2

    x2 + x = 20

    x2 +x - 20 = 0

    Solving this quadratic equation; x= -5 and 4

    By: Munesh Kumari
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