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7th Class Mathematics Algebraic Expressions Question Bank Algebraic Expressions

  • question_answer
    If \[x=-2,\text{ }y=3\]and \[z=1,\]then the value of expression \[{{x}^{3}}+{{y}^{3}}+{{z}^{3}}-3xyz\]is ___.

    A)  \[38\]       

    B)  \[37\]              

    C)  \[-37\]           

    D)         \[-38\]

    Correct Answer: A

    Solution :

                        \[{{(-2)}^{3}}+{{(3)}^{3}}+{{(1)}^{3}}-3(-2)\,(3)\,(1)\] \[=-8+27+1+18=38\]


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