Sharp EL-W516X Calculation Examples Manual

[lrdheat]

Some functions still yield domain error when setting d/dx=0 BUT, if one bypasses my methodology and just initially goes to the num-solve field and creates 0=d/dx(your equation, even with fractional powers of x), it appears to work consistently. Since the variable x is now stored with the critical point, just go back to num-solv, leave equation as is while getting rid of the d/dx, and make 0=y and solve. You now have the y value at the min or max that you have just found. If you return to home screen, pressing x and enter gives the x of interest, pressing y and entering gives the y value that goes with the x.

Remember to clear variables before calculating further problems using x or y.