add the sum of 3m square n+4mn-n square and 6n square- mn to 11m square n- 7 n square +12 mn
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Step-by-step explanation:
add the sum of 3m square n+4mn-n square and 6n square- mn to 11m square n- 7 n square +12 mn
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14m²-2n²+15mn
Step-by-step explanation:
3m²+4mn-1n²
-1mn+6n²
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3m²+3mn+5n²
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3m²+3mn+5n²to 11m²n-7n²+12mn
11m²n-7n²+12mn
+3m²+5n²+3mn
--‐------------------------
14m²-2n²+15mn
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