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7th Class Mathematics Algebraic Expressions Question Bank Algebraic Expressions

  • question_answer
    Subtract \[(2a-3b+4c)\] from the sum of \[(a+3b-4c),(4a-b+9c)\] and \[(-2b+3c-a)\].

    A)   \[3a+2b+4c\]

    B)   \[2a-2b+4c\]

    C)  \[3a-4b-2c\]

    D)  \[2a+3b+4c\]

    Correct Answer: D

    Solution :

    Sum  \[=(a+3b-4c)+(4a-b+9c)+\]\[(-2b+3c-a)\] \[=(a+4a-a)+(3b-b-2b)+(-4c+9c+3c)\] \[=4a+8c\] \[\therefore \]  Required difference \[=(4a+8c)-(2a-3b+4c)\] \[=4a+8c-2a+3b-4c=2a+3b+4c\]


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