[tex] {b}^{2} + 8b + 7 \\ {b}^{2} + 7b + b + 7 \\ b \times (b + 7) + b + 7 \\ (b + 7) \times (b + 1) \\ [/tex]
[tex] \\ [/tex]
[tex] {n}^{2} - 11n + 10 \\ {n}^{2} - n - 10n + 10 \\ n \times (n - 1) - 10(n - 1) \\ (n + 1) \times (n - 10) \\ \\ [/tex]
[tex] {m}^{2} + m - 90 \\ {m}^{2} + 10m - 9m - 90 \\ m \times (m + 10) - 9(m + 10) \\ (m + 10)\times (m - 9) \\ \\ [/tex]
[tex] {n}^{2} + 4n - 12 \\ {n}^{2} + 6n - 2n - 12 \\ n \times (n + 6) - 2(n + 6) \\ (n + 6) \times (n - 2)[/tex]
sorry hangang 4 lang
