6th Class Mathematics Algebraic Expressions - 854 Question Bank Algebraic Expressions

  • question_answer If \[A\text{ }=\text{ }7{{m}^{2}}+3mn-8{{n}^{2}},\text{ }B\text{ }=-4{{m}^{2}}+mn\]\[+4{{n}^{2}}\]and C = 3n2 - 4m2 - 4mn. Then find the value of A + B + C.

    A) \[-{{m}^{2}}+mn-{{n}^{2}}\]

    B) \[-{{m}^{2}}-mn-{{n}^{2}}\]

    C) \[-{{m}^{2}}+{{n}^{2}}\]

    D) \[-\left( {{m}^{2}}+{{n}^{2}} \right)\]

    E) None of these

    Correct Answer: D


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