Question

32n2 - 54m2 + 12mn 8n - 9m​

Answer 1

$32 {n}^{2} - 54 {m}^{2} + 12mn \: 8n - 9m = \\ 32 {n}^{2} - 54 {m}^{2} + (12 \times 8)mnn - 9m \\ 32 {n}^{2} - 54 {m}^{2} + 96mnn - 9m \\ = \bf32 {n}^{2} - 54 {m}^{2} + 96m {n}^{2} - 9m$