| Steps |
Key Sequence |
Screens |
| 1. Input Function or Piecewise-Defined Function. |
Press DIAMOND key, then F1 key (for Y=) |
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Type the function |
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| Method 1: Using home screen. |
| 2. Go to Home screen |
Press 2nd, then ESC |
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| 3. Select zeros function |
Press F2 |
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Press 4 (for zeros() |
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| 4. Type in Function |
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| Note: You can either type in the function directly
(e.g., 5 – 2x2 + x3) OR, if you followed
step 1 above, use y1(x) |
| 4. Type in Independent Variable |
Press comma key, then x, then right parenthesis |
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| Note: This will find ALL zeros of the function on the whole
domain of the function. |
| 5. Solve |
ENTER |
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| Note: If this returns something other than a value, then press DIAMOND key, then ENTER.
Alternatively, you can use the TI89's solve function. |
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| Method 2: Using grapher. |
| Follow Step 1 above |
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Type the function |
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| 2. Graph |
Press DIAMOND key, then F3 key |
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| 3. Find in |
Press F5 |
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Press 2 (for Zero) |
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Type in x-value for a point to the left of x-intercept or trace function until you reach the value for x |
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Press ENTER |
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Type in x-value for a point to the right of x-intercept or trace function until you reach the value for x |
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Press ENTER |
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| Note: In this case, the root of the function is x = –1.2419. |