Algebraic input in CAS
The 
CAS View allows you to use GeoGebra's CAS (Computer Algebra System) for symbolic computations.
CAS View allows you to use GeoGebra's CAS (Computer Algebra System) for symbolic computations. Equations and assignments
Equations are entered using an equal sign =, while the input := indicates an assignment.
Task
Put in the following Algebraic expressions to get in touch with the CAS Input Bar.
Instructions
| 1. = | Enter the equation 3x + 5 = 7 using the simple Equal sign into the CAS Input Bar and hit the Enter key. |
2.  | Note: If you want to show the corresponding line in the  Graphics View, click on the Visibility button next to the equation. |
| 3. := | Enter the function g(x) := 2 * x + 1 |
Hints:
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Try it yourself...
Using variables
In the CAS View, you can use variables that were not assigned any value.
CAS View, you can use variables that were not assigned any value.Task
Solve an equation step by step.
Instructions
| 1. |  | Type 5x - 2 = 8 and select the Keep Input tool. |
| 2. | # | In row 2, type the shortcut # to copy the previous output into the CAS Input Bar.
|
| 3. |  | Type +2 next to # and select the Symbolic Evaluation tool.
|
| 4. | #
| Copy again the previous output 5x = 10 into the next row. |
| 5. |  | Type / 5 next to # and select the Symbolic Evaluation tool. |
| 6. | | In row 1, click on the disabled Visibility button to display the original equation in the Graphics View and check your solution. |
#copies the previous output.#3copies the output of row 3.
Try it yourself...
Multiplications
Multiplication of variables needs to be marked explicitly using an asterisk
* or with a space.
Example: The input b * (c + d) gives you the output bc + bd.
Note: If you enter bc without the asterisk or a space between the factors, you will create a new variable called bc.