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Question: why solve gives solution with big O in it? What does it actually mean?

Question:why solve gives solution with big O in it? What does it actually mean?

nm 10184 Maple 2022
solve big-o notation
February 17 2023
2

I have only seen big O show up in series solutions, as in 

series(sin(x),x)

I've never seen it before show up in result of solve

restart;
eq:=x=p*(a*ln(p+sqrt(p^2-2))+2*_C1)/(2*sqrt(p^2-2));
sol:=solve(eq,p);

What does it actually mean when the solution has  O(RootOf(....))?  

Should not result of solve be exact? isn't having big O means an approximation?

Maple 2022.2 on windows 10
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