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8th Class Mathematics Algebraic Expressions Question Bank Algebra

  • question_answer
    If \[{{\text{a}}^{\text{3}}}\text{+}{{\text{b}}^{\text{3}}}\text{+}{{\text{c}}^{\text{3}}}\text{=3abc if a+b+c=0}\] then x is equal to

    A) 1                                 

    B) 2

    C) 3                                 

    D) none of these

    Correct Answer: B

    Solution :

    \[x=1\] \[\Rightarrow \]\[3x-7y=10\] \[xy=-1\] \[9{{x}^{2}}+49{{y}^{2}}\]


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