Question

1 ) (m²+n²) - (m²-3mn-2n²)

2) (9m²-2mn+n²) + (m²+n²) + ( m²-3mn-2n²)​

Answer 1

Answer:

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Answer 2

Answer:

1) (m² + n²) - (m² - 3mn - 2n²)

m² + n² - m² + 3mn + 2n²

m² - m² + n² + 2n² + 3mn

3n² + 3mn.

2) (9m²- 2mn+n²) + (m² + n²) + ( m² - 3mn - 2n²)

9m² - 2mn + n² + m² + n² + m² - 3mn - 2n²

9m² + m² + m² - 2mn - 3mn + n² + n² - 2n²

11m² - 5mn

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