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7th Class Mathematics Integers Question Bank Integers

  • question_answer
    For what values of \[a\] and \[b\] does the expression, \[[12+(-\,5)]+a=b+[(-\,5)+(-\,8)]\] show the associative property of integers under addition?

    A)  \[8\text{ }and\text{ 1}2\]                      

    B)  \[-\,8\text{ }and\text{ 1}2~\]

    C)  \[12\text{ }and\text{ }8\]                      

    D)  \[-12\text{ }and\text{ }8~\]

    Correct Answer: B

    Solution :

    (b) LHS; \[\left[ 12+\left( -5 \right) \right]+a=7+a\] RHS; \[b\left[ \left( -5 \right)+\left( -8 \right) \right]=b-13\] Now \[7+a=b-13\] is true Fora\[=-8\]and \[b=12\]


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