Multiple Choice Questions on The sum of twice the square of a number and 7 times the number equals 15 What is the number ........ for Mathematics - All Exams Preparation

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Multiple Choice Questions

The sum of twice the square of a number and 7 times the number equals 15 What is the number ........

Quantitative Aptitude ( CCS) Number System
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    The sum of twice the square of a number and 7 times the number equals 15. What is the number?

    1/2

    Incorrect Answer

    3/4

    Incorrect Answer

    3/2

    Correct Answer

    5/3

    Incorrect Answer
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    Explanation:

    2x2 + 7x = 15
    2x2 + 7x – 15 = 0
    2x2 + 10x-3x – 15 = 0
    2x(x+5)-3(x+5) = 0
    (x+5)(2x-3) = 0
    x = -5 or x = 3/2

    By: Amit Kumar
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