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KaptajnKold · Answer 1 · 2020-10-12T17:21:30+0000

Answer:

3m² + 2mn + 7n²

Explanation:

subtract m² + 3mn - n² from 4m² + 5mn + 6n², that is

4m² +5mn + 6n² - (m² + 3mn - n² )

= 4m² + 5mn + 6n² - m² - 3mn + n² ← collect like terms

= 3m² + 2mn + 7n²