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

ADD (-7m2n + 8mn2 - 12mn) + (6nm - 8n2m +9nm2)

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- Mar 16th 2006, 09:45 PMjim1174not sure how to do this
I am not sure how to do this can you help ?

ADD (-7m2n + 8mn2 - 12mn) + (6nm - 8n2m +9nm2) - Mar 17th 2006, 08:33 AMThePerfectHackerQuote:

Originally Posted by**jim1174**

$\displaystyle (-7m^2n+8mn^2-12mn)+(6nm-8n^2m+9nm^2)$

Open the parantheses,

$\displaystyle -7m^2n+8mn^2-12mn+6nm-8n^2m+9nm^2$

Now add like terms only.

For example you can add $\displaystyle mn^2$ with $\displaystyle n^2m$ but not with $\displaystyle m^2n$.

Thus, $\displaystyle 2nm^2-6mn$

Note, there is no $\displaystyle mn^2$ term because $\displaystyle 8mn^2-8n^2m=0$ :eek: