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


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