26. Determine whether the polynomial in Z[x] satisfies an Eisenstein Criterion for irreducibility over Q: (a) 4x10 – 9x³ + 24x – 18 (b) 3x° +18x² +24x +'6 (c) 2x1º+25x³+10x² -30

Linear Algebra: A Modern Introduction
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ISBN:9781285463247
Author:David Poole
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Chapter6: Vector Spaces
Section6.2: Linear Independence, Basis, And Dimension
Problem 61EQ
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23. Prove that if D is an integral domain, then D[x]is also an integral domain.
24. Use the division algorithm to find polynomials q(x) and r(x) so that
f(x) = g(x)q(x) + r(x), with degree of r(x) less that degree of g(x):
(a) f(x) =x + 3x° +4x² – 3x +2 and g(x) = 3x² + 2x -3 in Z¬[x].
(b) f(x) = x* + 5x³ -3x² and g(x) = 5x² – x + 2 in Z1[x].
25. Express the following polynomials in Zs[x] as a product of irreducible polynomials of
Zs[x]:
(a) x' + 2x + 3
(b) 2x' +x? + 2x+2
26. Determine whether the polynomial in Z[x] satisfies an Eisenstein Criterion for
irreducibility over Q:
(a) 4x10 – 9x³ +24x – 18
(b) 3x° +18x² +24x +'6
(c) 2xº+25x²+10x² -30
27. Demonstrate that x + 3x – 8 is irreducible over Q.
Transcribed Image Text:23. Prove that if D is an integral domain, then D[x]is also an integral domain. 24. Use the division algorithm to find polynomials q(x) and r(x) so that f(x) = g(x)q(x) + r(x), with degree of r(x) less that degree of g(x): (a) f(x) =x + 3x° +4x² – 3x +2 and g(x) = 3x² + 2x -3 in Z¬[x]. (b) f(x) = x* + 5x³ -3x² and g(x) = 5x² – x + 2 in Z1[x]. 25. Express the following polynomials in Zs[x] as a product of irreducible polynomials of Zs[x]: (a) x' + 2x + 3 (b) 2x' +x? + 2x+2 26. Determine whether the polynomial in Z[x] satisfies an Eisenstein Criterion for irreducibility over Q: (a) 4x10 – 9x³ +24x – 18 (b) 3x° +18x² +24x +'6 (c) 2xº+25x²+10x² -30 27. Demonstrate that x + 3x – 8 is irreducible over Q.
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