Answer
See below
Work Step by Step
General form of vector space $V$ is $p(x)=a_x^n+a_{n-1}+...+a_1x+a_0$
with $a_0,a_1,...a_n \in R$
We can see that zero vector in $V$ is $q(x)=0$
Hence, additive inverse $-A=-a_x^n-a_{n-1}-...-a_1x-a_0$
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