Question
In the following exercises, add or subtract the polynomials. $\left(m^2+2 n^2\right)-\left(m^2-8 m n-n^2\right)$
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Add or subtract the polynomials. $$\left(m^{2}+2 n^{2}\right)-\left(m^{2}-8 m n-n^{2}\right)$$
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