subtract.: 5mn - 3mn + n². From 7m² + mn - 4n²
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Answer:
7m² - 5n² - mn
Step-by-step explanation:
= 7m² + mn - 4n² – ( 5mn -3mn + n²)
= 7m² + mn - 4n² -5mn +3mn - n²
= 7m² + mn - 4n² -2mn -n²
= 7m² + mn -2mn -4n² - n²
= 7m² - mn - 5n²
= 7m² -5n² - mn (Ans)
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