The zeroes of a function
are the *x*-values where the graph of the function intersects the *x*-axis. Another name for the zero of a function is the x-intercept of a function.

In order to find the
zeroes of a function, a graph must already be displayed on the screen. To learn
how to enter and graph a function, go to **Graphing
a Function**. Note that the function,
**=** , below crosses
the *x*-axis in 3 places; thus, there are 3 zeroes.

To find one of the
zeroes, press **2nd TRACE [CALC], **then select **2:Zero**.

To locate the leftmost zero, use
the **Left Arrow Key ** to move the flashing cursor slightly to the left
of the zero, then press **ENTER. **

A right arrow above the graph marks the left bound selection.

Now use the **Right**
**Arrow Key** to move the flashing cursor slightly to the right of the zero,
and then press **ENTER.**

Note that both the left bound and right bound are marked with small arrows above the graph.

Now move the cursor as close to
the zero as possible and then press **ENTER **again**. **The last screen
shows that this zero is approximately *x *= -2.33.

The other two zeros
may be calculated by repeating the above process for each of them. Below are
the results.

The results are approximately *x* = 0.20 and *x* = 2.13.

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