Add m^2 - 3mn, m^2 + mn, mn+ n^2
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Answer:
2m²-mn+n²
Step-by-step explanation:
(m²-3mn)+(m²+mn)+(mn+n²)
By rearranging the terms:-
(m²-3mn)+(m²+mn)+(n²+mn)
m²-3mn+m²+mn+n²+mn
=>m²+m²+n²-3mn+mn+mn
=>2m²+n²-mn or, 2m²-mn+n²
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