Texas Instruments TI-89 Manuel D’Utilisation

Activities

 744

Detailed information about using the functions in this example can be found in Symbolic 
Manipulation.

Performing Computations to Derive the Quadratic Formula

Performing Computations to Derive the Quadratic Formula

Performing Computations to Derive the Quadratic Formula

Performing Computations to Derive the Quadratic Formula

Perform the following steps to derive the quadratic formula by completing the square of 
the generalized quadratic equation.

1. Clear all one-character variables in the 

current folder. 
2 ˆ
Choose 

 and press 

¸ to 

confirm.

2. On the Home screen, enter the 

generalized quadratic equation: 

2

.

3. Subtract c from both sides of the 

equation.
2 ± | j 

 This example uses the result of the 

last answer to perform computations on 
the TI-89 Titanium. This feature reduces 
keystroking and chances for error.