Solution
= Solution
For these real-valued <functions>, \b[$f(n)=O(g(n))$] means that there exist constants $C>0$ and $N\in\mathbb N$ such that
$$
|f(n)|\leq C|g(n)|\qquad\text{for every }n\geq N.
$$
The absolute values matter because neither <function> is assumed nonnegative. The constants are independent of $n$; finitely many earlier values do not affect <Big O notation>.