Suppose that f(n) = 25 * n2 .
| n | f(n) |
| 2 | 100 |
| 3 | 225 |
| 4 | 400 |
| 5 | 625 |
| 6 | 900 |
The log-log graph makes it obvious that f(n) is O(n2).
The points that are plotted from the function lie on a straight line that is parallel to a known O(n2) line.
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