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7th Class Mathematics Algebraic Expressions Question Bank Algebraic Expressions

  • question_answer
    What is the difference between \[a+b\] and \[a-b\]

    A) \[2b\]                           

    B)  \[2a\]

    C) \[2a+2b\]                   

    D)  \[2a-2b\]

    Correct Answer: A

    Solution :

    \[(a+b)+(a-b)=a+b-a+b\] \[=b+b=2b\] It is a good idea to memorizes\[(a+b)+\]\[(a-b)=2a\] and\[(a+b)-(a-b)\]. This will be helpful to expedite your calculations now and also in higher classes.


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