I am asking this question again, because the last response I was given just gave that the the other polynomial was 2x+3, and provided no explanation as to how that was arrived at.  Show that 4x2+6x+3 is a unit in Z8[x].All that I know that I have to do is find a polynomial such that(4x2+6x+3)(polynomial)=1, but I'm not sure the steps in general to follow. I think after multiplying the two polynomials the coefficients will have to turn out to be 0 mod 8 and the constant term will have to be 1 mod 8.  How do I approach any problem of this type?  I have no examples to go by, and I need to know the thinking process that is needed to solve these types of problems.  Thanks!

Question
Asked Nov 2, 2019

I am asking this question again, because the last response I was given just gave that the the other polynomial was 2x+3, and provided no explanation as to how that was arrived at. 

Show that 4x2+6x+3 is a unit in Z8[x].

All that I know that I have to do is find a polynomial such that

(4x2+6x+3)(polynomial)=1, but I'm not sure the steps in general to follow. I think after multiplying the two polynomials the coefficients will have to turn out to be 0 mod 8 and the constant term will have to be 1 mod 8.  How do I approach any problem of this type?  I have no examples to go by, and I need to know the thinking process that is needed to solve these types of problems.  Thanks!

check_circleExpert Solution
Step 1

To invert the given polynomial in t...

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