Multiple Choice Questions on I x2 9x 20 0 II 8y2 ndash 15y 7 0 ........ for IBPS RRB - Officers Exam Preparation

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Multiple Choice Questions

I x2 9x 20 0 II 8y2 ndash 15y 7 0 ........

Quantitative Aptitude(IBPS RRB PO) Quadratic Equations
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    In the following question two equations are given in variables X and Y. You have to solve these equations and determine the relation between X and Y.

    I. x2 + 9x + 20 = 0

    II. 8y2 – 15y + 7 = 0

    y > x

    Correct Answer

    y < x

    Incorrect Answer

    y ≥ x

    Incorrect Answer

    y ≤ x

    Incorrect Answer

    x = y or relation can't be determine

    Incorrect Answer
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    Explanation:

    x2 + 9x + 20 = 0
    x2 + 4x + 5x + 20 = 0
    x(x + 4) + 5(x + 4) = 0
    (x + 5)(x + 4) = 0
    x = – 4 , –5
    8y2 – 15y + 7 = 0
    8y2 – 8y – 7y + 7 = 0
    8y(y – 1) – 7(y – 1) = 0
    (8y – 7)(y – 1) = 0
    y =7/8 , 1
    So, y > x.

    By: Munesh Kumari
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