Answer:
[tex]6 {x}^{2} - 17x + 12 \\ 6 {x}^{2} - 9x - 8x + 12 \\ 3x(2x - 3) - 4(2x - 3) \\ (3x - 4)(2x - 3)[/tex]
[tex] {x}^{2} + 8x + 16 \\ {x}^{2} + 4x + 4x + 16 \\ x(x + 4)4(x + 4) \\ (x + 4)(x + 4)[/tex]