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7th Class Mathematics Algebraic Expressions Question Bank Algebraic Expressions

  • question_answer
    If x = 2, y = 5 and z = - 7, then the value of \[{{x}^{2}}+{{y}^{2}}+{{z}^{2}}-2xyz\]is ____.

    A) -62 

    B) 218

    C) -63

    D) 212

    E) None of these

    Correct Answer: B

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