Casio fx-9750gII looking for factorial function (x!)

SOURCE: How to find zeros of

First you can use the Solver found under the EQUA menu.


You can also graph the function, then use the G-Solve feature.
See the sequence of screen captures below.
Press Menu then Graph to open the Y= editor.
Type in the expression (without the =0 part) and


Press the F6: DRAW tab.


While the graph is being displayed press the F5:G-Solve key.


In Gsolve screen press F1: root.


The calculator hopefully finds a root (here at the left)


Press the right arrow to find the root at the right.


I will not guarantee that it will always be this easy.