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6th Class Mathematics Algebra Question Bank Algebra

  • question_answer
    If \[x=2,\] \[y=3\] and \[z=-5\] then \[{{x}^{3}}+\]\[{{y}^{3}}+\]\[{{z}^{3}}=?\]

    A)  90                              

    B)  \[-90\]

    C)  0                                

    D)  \[-90xyz\]

    Correct Answer: B

    Solution :

    \[{{x}^{3}}+{{y}^{3}}+{{z}^{3}}\] \[={{(2)}^{3}}+{{(3)}^{3}}+{{(-5)}^{3}}\] \[=8+27-125\] \[=35-125=-90\]


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