The question is nonsense as written. If a polynomial f(x) in Q[x] is reducible (spelling!) in Z[x], then f(x) = g(x)h(x) were g(x) and h(x) are in Z[x]. We assume that the degrees of g(x) and h(x) are > 0. This means that g(x) and h(x) have integer coefficients. When multiplied, the product...