Factorization of 2x ^ 3-8x ^ 2 + X + 6 by undetermined coefficient method

Factorization of 2x ^ 3-8x ^ 2 + X + 6 by undetermined coefficient method


Let the above formula = (2x ^ 2 + ax + b) (x + C) = 2x ^ 3 + 2cx ^ 2 + ax ^ 2 + ACX + BX + BC, from the corresponding coefficients are equal: a + 2C = - 8 AC + B = 1 BC = 6, three equations and three unknowns can be solved, and can be substituted



When x belongs to (2,3), 2x ^ 2-9x + A


a



(1-1 / 2x) ^ 10 coefficient of 1 / x ^ 5 expansion


-(63/8)