# HP Prime for All

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With HP Prime, you can choose whether to operate numerically in the Home view or symbolically using the CAS in the CAS view. For example, press H and enter 8 in the Home view to see 2.828… or press K and enter the same expression in the CAS view to see 28

1. Calculation History
• Tap to select an entry
• Tap twice to copy it to the command line
2. Command Line Editor
• 2D textbook format
• Tap to activate
• Context-Sensitive

Things you can do in both CAS and Home views:

• Tap an item to select it or tap twice to copy it to the command line editor
• Tap and drag up or down to scroll through the history of calculations
• Press Z to retrieve a previous entry or result from the other view
• Press the Toolbox key b to see the Math and CAS menus as well as the Catalog
• Press c to open a menu of easy-to-use templates
• Press J to exit these menus without making a selection

RPN Note: HP Prime supports RPN entry. In Home Settings (S H ), navigate to Entry and select RPN.
These workshop materials use the default Textbook setting.

## Example: Infinite Series

Suppose we wish to explore the series 1+23+45+87+169...

To begin with, we can compute the first few partial sums.

1. Press H to enter the Home view.
2. Type 1 and press E
3. Press +3/2E
4. Press e to cycle through its decimal, proper fraction, and improper fraction forms
5. Continue as shown to the right until you have the first 5 partial sums

Another approach is to use lists. In the figure to the right, the List L1 is first defined to contain the 1 st partial sum (1), followed by the numerator and denominator of the following term. The second line adds the next term to the sum, then adds 2 to the numerator and multiplies the denominator by 2, and stores the result back into list L1.
From there, just pressing E generates the partial sums.

To use the CAS, we observe that the sum can be rewritten symbolically as:

1+23+45+87+169...=n=02n1+2n

1. Press K to open the CAS view.
2. Press c to open the template menu and select the summation template
3. To enter n=0, press ASn>0
4. To enter + at the top, tap on the top and press + , then S9 and tap on
5. Tap on the right template box and enter the rational expression.
6. When you are done, press E

Home and CAS views are just the tip of the iceberg. Move to HP Apps to explore rest.