Помогите решить!!! (c-2)(c+3)(c-1)

(c - 2)(c + 3)(c - 1) =  = (c^2 + c - 6)(c - 1) =  = c^2(c - 1) + c(c - 1) - 6(c - 1) =  = c^3 - c^2 + c^2 - c - 6c + 6 =  = c^3 - 7c + 6