
For example, in the picture at left, when the expression 6.p is shaded, it means you are able to work with it and can sum, divide, multiply it or to do other operations. To do it just press some of the operators (+, , / , x, log, y^x).
HP49 inserts parentesis "( )", automatically, when needed.
In the HP49 Equation Writer, sometimes, a part of the equation shaded (painted of black).
It means that it is the part of equation you can work on it.
Press arrow keys to mark the equation and
the mathematical operator to continue.
This resourse of HP49 Equation Writer permits you know what is the part of the equation that you are working on it. Use arrow keys, go back or forward, up or down to correct the equation or also insert new elements.
The command EDIT permits you to correct the part of the equation shaded (painted of black). 
