2x^5-5x^4-11x^3+23x^2+9x-18 Factorization

2x^5-5x^4-11x^3+23x^2+9x-18 Factorization

Do you notice the characteristics of this formula? Add the coefficients with positive sign and negative sign respectively, and their sum is equal. This shows that there are two factors X-1 and X + 1, so we can use the undetermined coefficient method to get the original formula = (x + 1) (x-1) (2x ^ 3 + ax ^ 2 + Bxx + C) and compare the corresponding coefficients, or use the root method. Let x = 3, x = - 2