Let F be a field and let f(x) be an irreducible polynomial in F[x]. Then f (x) has a multiple root in some field extension if and only if f'(x) = 0.
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- 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.Let be an irreducible polynomial over a field . Prove that is irreducible over for all nonzero inProve Theorem If and are relatively prime polynomials over the field and if in , then in .
- Let 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.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.
- Let be a field. Prove that if is a zero of then is a zero ofTrue 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 .Let where is a field and let . Prove that if is irreducible over , then is irreducible over .
- If is a finite field with elements, and is a polynomial of positive degree over , find a formula for the number of elements in the ring .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]