Question

i 4m²- 7n²+5mn, 3n²+5m²-2mn​

Answer 1

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$\sf4 {m}^{2} - 7 {n}^{2} + 5mn + 3 {n}^{2} + 5 {m}^{2} - 2mn$

$\sf4 {m}^{2} + 5 {m}^{2} - 7 {n}^{2} + 3 {n}^{2} + 5mn - 2mn$

$\sf9 {m}^{2} - 4 {n}^{2} + 3mn$