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The zero function is used to find x-intercepts.

Graph an equation with an x-intercept. (In this example, x2-5).

Press 2ND CALC (above TRACE), and select option 2, "zero". The calculator will ask "Left Bound?". Move the flashing x-like shape to the left of the x-intercept that you want to find with the arrow keys and press ENTER. Then the calculator will ask "Right Bound?". Move the x-like shape to the right of the x-intercept and press ENTER. The calculator will then ask "Guess?". Move the flashing shape to a point close to the x-intercept and press ENTER. The calculator will give you the coordinates of the x-intercept.

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Q: How do you use the zero feature on the TI-84 Plus?
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