I realize this must be a very simple question, but how do I evaluate expressions containing symbols?
Suppose you have a simple expression, for instance:
X*(M-1)I would like to press on a key that did:
-------
X*(M+1)
- Prompts for all the values of the symbols, such as X, M in the example, showing the previous value if any.
- Returns the value of the expression.
Many thanks... as you can see, I am a beginner with my 50g.
Luca