Answer:
f(x) = (x^3 + 4x^2 + x - 6)
Explanation:
f(x) = (x-1)(x+2)(x+3)
Start with two polynomials
(x-1)(x+2) = (x^2+2x-x-2) = (x^2+x-2)
Multiply that result by the remaining binomial
(x^2 + x - 2)(x + 3) = (x^3 + 3x^2 + x^2 + 3x - 2x -6) = (x^3 + 4x^2 + x - 6)