Multiple Choice Questions on I 2x2 31x 120 II 8y2 74y 143 ........ for Mathematics - All Exams Preparation

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Multiple Choice Questions

I 2x2 31x 120 II 8y2 74y 143 ........

Quantitative Aptitude ( CCS) Quadratic Equations
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    I. 2x2-31x= -120

    II. 8y2-74y=-143

    x > y

    Correct Answer

    x ≥ y

    Incorrect Answer

    x < y

    Incorrect Answer

    x ≤ y

    Incorrect Answer
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    Explanation:

    2x2-31x= -120
    2x2 -16x-15x+120=0
    2x(x -8) -15(x -8)=0
    (x-8) ( 2x-15)=0
    x= 8 , 15/2
    8y2-74y=-143
    8y2 -22y-52y+143 =
    2y( 4y-11) -13(4y-11)=0
    (4y-11) ( 2y-13)=0
    y= 11/4, 13/2
    Hence x>y

    By: Amit Kumar
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