Hi, please help me with this problem... Why does that (m-n) suddenly disappear?? below pic. Thank you!
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Say you have: $\displaystyle a=(m-n)$, $\displaystyle b=(m^2+mn+n^2)$, and $\displaystyle c=(m+n)$ Then, $\displaystyle ab+ca$ taking out the common factor of $\displaystyle a$ you have: $\displaystyle a(b+c)$
Ah, I think I understand now. Thank you very much : )
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