Related Post: X 3 2x 2 12x 9 Solve X 4 4x 3 2x 2 12x 9 0 2x 3 X 2 12x 9 0 Factor X^4-4x^3-2x^2+12x+9 Factorise 2x 3 X 2 12x 9 F X )=- 2x 3 9x 2 12x 1 F X )= 2x 3 9x 2 12x F X )= 2x 3 9x 2 12x 15 F X )= 2x 3 9x 2 12x 20 Let F X )= X 4 4x 3 2x 2 12x 9