7th Class Mathematics Algebraic Expressions - 854 Question Bank Algebraic Expressions and Linear Equation

  • question_answer
    After simplification. Find the value of the following algebraic expression at m = -3, n = 2 and r = -1.
    \[\mathbf{3}\left( {{\mathbf{m}}^{\mathbf{2}}}\mathbf{+}{{\mathbf{n}}^{\mathbf{2}}}\mathbf{-3 mnr+}{{\mathbf{r}}^{\mathbf{2}}} \right)\mathbf{-[5}\left( \mathbf{2}{{\mathbf{m}}^{\mathbf{2}}}\mathbf{+}{{\mathbf{n}}^{\mathbf{2}}}\mathbf{-2mn} \right)\mathbf{-\{-}\] \[{{\mathbf{r}}^{\mathbf{3}}}+\mathbf{3}\left( \mathbf{m}-\mathbf{2} \right)\text{ }+\text{ }\mathbf{8m}{{\mathbf{n}}^{\mathbf{2}}}\}]\]

    A) 638  

    B)  -732

    C) -638     

    D)  732

    E)              None of these

    Correct Answer: B


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