| Steps |
Key Sequence |
Screens |
| Method 1: Use to find solutions of f1(x) = f2(x). |
| Example: Solve x3 + 3x2 + 2x = 5. |
| 1. Input f1(x) into Y1 (in this example Y1=x3+3x2+2x) |
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| 2. Input f2(x) into Y2 (in this example Y2=5) |
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| 3. Graph |
Press GRAPH |
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| 4. Find Intersection |
Press 2nd, then TRACE (for CALC) |
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Press 5 (for intersect) |
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Press ENTER two (2) times |
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Move cursor close to intersection, then press ENTER |
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| NOTE: The point of intersection is on the bottom of the TI83 screen. The solution
is the x-coordinate of the intersection. Repeat Step #4
for other intersections. |
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| Method 2: Use to find one root of f1(x) – f2(x) = 0 |
| Example: Solve x3 + 2x = –3x2. |
| Rewrite the equation so that all terms are on one side: x3 + 3x2 + 2x = 0 |
| 1. Set Up Solve() Function |
Press 2nd, then 0 (for CATALOG() |
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Press LN key to scroll down to S |
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Scroll down to solve( |
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Press ENTER |
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| 2. Type in Function |
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| 3. Input Independent Variable |
Press comma, then variable solving for, then comma |
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| 4. Input Guess |
Type number near one of the roots, then right parenthesis |
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| 5. Execute |
Press ENTER |
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| NOTE: This method finds only one solution. You will need to input several
guesses to find all the roots. |