# “Finding f(0): Solving for the Function Given by a Table”

When given a table of input-output pairs in math, it can be tempting to think of them as independent data points without any connection to each other. However, if the table represents a function, there is a relationship between the inputs and outputs that can be used to solve for the value of the function at f(0).

To find f(0), we need to look for an input-output pair where the input (which represents the function’s variable) is equal to 0. Depending on how the table is set up, this may be straightforward or require some manipulation.

For example, let’s say we have the following table:

| x | f(x) |
| — | —- |
| 1 | 2 |
| 2 | 4 |
| 3 | 6 |

To find f(0), we need to look for the row where x is equal to 0. However, there is no such row in this table! But all is not lost. We can use the pattern we see in the table (that each output is twice the input) to extend the table to negative inputs and find the value of the function at f(0).

If we continue the pattern of doubling each input to get the output, we get:

| x | f(x) |
| — | —- |
| -3 | -6 |
| -2 | -4 |
| -1 | -2 |
| 0 | 0 |
| 1 | 2 |
| 2 | 4 |
| 3 | 6 |

Now we can see that when x is equal to 0, f(x) is equal to 0 as well. Therefore, f(0) = 0.

This method of extending the table based on patterns in the input-output pairs can be used for more complicated tables as well. By looking for patterns and using them to make educated guesses about the value of the function at f(0), we can solve for a wide variety of functions given by tables.