Multiple Choice Questions on Find x y sup2 ndash x ndash y sup2 ........ for RRB(NTPC) Exam Preparation

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Multiple Choice Questions

Find x y sup2 ndash x ndash y sup2 ........

Quantitative Aptitude (RRB NTPC) Algebra
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    Find (x+y)²–(x–y)²?

    2x²y²

    Incorrect Answer

    4xy

    Correct Answer

    2x²+2y²

    Incorrect Answer

    x²–y²+2xy

    Incorrect Answer
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    Explanation:
    (x+y)²–(x–y)²
    = (x+y+x–y)(x+y–x+y)
    = (2x)×(2y) = 4 xy

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