Question: How do I use the fact that R is a communitive ring? I know this: Let R be an integral domain. If P(x) 6= 0
How do I use the fact that R is a communitive ring? I know this: Let R be an integral domain. If P(x) 6= 0 and Q(x) 6= 0 are polynomials in R[x], then deg P(x)Q(x) = deg P(x) + deg Q(x). But i dont think that would apply here. Solutions with explanations would help.

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