1. Let F be a field. Suppose that the polynomial ƒ(x) = F[x] is a unit in the polynomial ring F[x]. Prove that f(x) = a must be a constant polynomial, where a E F is a non-zero element of the field. Hint: Let g(x) = F[x] be the multiplicative inverse of f(x). What can you say about deg f(x) and deg g(x)?
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- Prove Theorem If and are relatively prime polynomials over the field and if in , then in .Suppose that f(x),g(x), and h(x) are polynomials over the field F, each of which has positive degree, and that f(x)=g(x)h(x). Prove that the zeros of f(x) in F consist of the zeros of g(x) in F together with the zeros of h(x) in F.True or False Label each of the following statements as either true or false. Every polynomial equation of degree over a field can be solved over an extension field of .
- Prove that a polynomial f(x) of positive degree n over the field F has at most n (not necessarily distinct) zeros in F.Corollary requires that be a field. Show that each of the following polynomials of positive degree has more than zeros over where is not a field. over overLet F be a field and f(x)=a0+a1x+...+anxnF[x]. Prove that x1 is a factor of f(x) if and only if a0+a1+...+an=0. Prove that x+1 is a factor of f(x) if and only if a0+a1+...+(1)nan=0.
- Let be a field. Prove that if is a zero of then is a zero ofProve Theorem Suppose is an irreducible polynomial over the field such that divides a product in , then divides some .Use Theorem to show that each of the following polynomials is irreducible over the field of rational numbers. Theorem Irreducibility of in Suppose is a polynomial of positive degree with integral coefficients and is a prime integer that does not divide. Let Where for If is irreducible in then is irreducible in .
- Suppose S is a subset of an field F that contains at least two elements and satisfies both of the following conditions: xS and yS imply xyS, and xS and y0S imply xy1S. Prove that S is a field. This S is called a subfield of F. [Type here][Type here]Prove Corollary 8.18: A polynomial of positive degree over the field has at most distinct zeros in8. Prove that the characteristic of a field is either 0 or a prime.