Texas Instruments TI-84 Plus Silver Edition

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Example: Now find the zero that is near x = 1.
Press 2
nd
TRACE and select zero .
Move the cursor so that it is to the left of the zero. The location of the zero means the left bound
needs to have a positive y value.
Press ENTER .
Now move the cursor to that it is to the right of the zero. The point will need to have a negative
y value.
Now press ENTER .