I typed up this set of instructions for finding the x-intercepts of a graph using the TI-84 for my Algebra 2 students to fill in and glue in their interactive notebooks.

I also created a similar set of instructions for finding the y-intercept of a graph using the TI-84 calculator.

## Steps for Finding the X-Intercepts of Graph Using the TI-84

- Enter the equation into Y1
- Press
**GRAPH** - Open the Calculate Function (
**2ND TRACE**) - Select
**Option 2: ZERO** - Move the blinking cursor to the left of where the graph crosses the x-axis
- Press
**ENTER** - Move the blinking cursor to the right of where the graph crosses the x-axis
- Press
**ENTER** - Move the blinking cursor as close as possible to where the graph crosses the x-axis
- Press
**ENTER** - Record the x-intercept
- Repeat this process if the graph has more than one x-intercept

Another thing that throws my students off is the fact that they are rarely asked to find the x-intercepts of a graph on their end-of-instruction exam. Instead, they will be asked to find the roots, solutions, or zeros of an equation. I really try to drive home the fact that anytime they are asked for roots, solutions, or zeros, they are really just being asked to find the x-intercept.

I told my students to draw a box around this fact, star it, add exclamation points, or anything that would make it stand out in their notes. They noted that the way I had boxed it in on mine looked like the state of Oklahoma. I joked that I had done that on purpose because the state of Oklahoma was requiring them to know this fact.

My students really struggled with the left bound and right bound instructions, so I shared with them a tip I learned from @druinok. She has her students place the cursor as close to the point as possible and then click the left arrow a few times for left bound and the right arrow a few times for right bound. My students thought this was the best trick ever. It really cut down on the mistakes they were making.

## Free Download of Instructions for Finding the X-intercepts of a Graph using the TI-84

Finding x-Intercepts of Graphs Notes (PDF) (310 downloads)

Finding x-Intercepts of Graphs Notes (Editable Publisher File ZIP) (303 downloads)