Given: Z [x] is the set of
all polynomials with variable x and integer coefficients
with the operations of polynomial addition and multiplication. A
general element in Z [x] has the form
ƒ(x) = an x n + an-1 x n-1 + … + a1 x + a0
where an , an-1, …, a1,
a0 are integers and n is a non-negative
integer.
Z [x] is a ring but not a
field.
1) Choose a specific polynomial
in Z [x], and prove that no other
polynomial in Z [x] is its
multiplicative inverse. Justify your work.