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Math Help - not sure how to do this

  1. #1
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    not sure how to do this

    I am not sure how to do this can you help ?

    ADD (-7m2n + 8mn2 - 12mn) + (6nm - 8n2m +9nm2)
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  2. #2
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    Quote Originally Posted by jim1174
    I am not sure how to do this can you help ?

    ADD (-7m2n + 8mn2 - 12mn) + (6nm - 8n2m +9nm2)
    I understand the problem as,
    (-7m^2n+8mn^2-12mn)+(6nm-8n^2m+9nm^2)
    Open the parantheses,
    -7m^2n+8mn^2-12mn+6nm-8n^2m+9nm^2
    Now add like terms only.
    For example you can add mn^2 with n^2m but not with m^2n.
    Thus, 2nm^2-6mn
    Note, there is no mn^2 term because 8mn^2-8n^2m=0
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