Sharp EL-W516X Calculation Examples Manual

[lrdheat]

This is where copy/paste would help. I think you are looking at the equation in table to get an idea of where the max/mins of the function are. The table should suggest one between 4 and 5. What you see on the table between 9 and 10 is a root of the equation, i.e, f(x), not f'(x). The 4.46 that you are seeing in num-solv is where you are finding roots for d/dx of your equation based on your guess educated by your table. After finding your max/mins, then edit the equation in num-solve where 0= is made y=, and put the curser on the first spot right of the =, press delete to get rid of d/dx. Now you can find the value of the function at the x's that produced the max or mins.