Let us consider Z[x]. a. Is Z[x] a UFD? Why? b. Show that {a + xf(x)|a

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Let us consider Z[x]. 

a. Is Z[x] a UFD? Why? 

b. Show that {a + xf(x)|a ∈ 2Z, f(x) ∈ Z[x]} is an ideal in Z[x]. 

c. Is Z[x] a PID? (Consider part (b).) 

d. Is Z[x] a Euclidean domain? Why?

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