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7th Class Mathematics Algebraic Expressions Question Bank Algebraic Expressions

  • question_answer
    If \[l=-1\] and \[m=2,\]then the value of \[4{{l}^{2}}+9{{m}^{2}}+2lm-9{{l}^{2}}m\] is ____.      

    A)  39                              

    B)  24                              

    C)  18                  

    D)         36                  

    Correct Answer: C

    Solution :

    We have \[4{{l}^{2}}+9{{m}^{2}}+2lm-9Fm\] \[=4{{(-1)}^{2}}+9{{(2)}^{2}}+2(-1)\,(2)-9{{(-1)}^{2}}(2)\] \[=4+36-4-18=40-22=18\]


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