Sharp EL-W516X Calculation Examples Manual

[lrdheat]

Lightbulb moment!

Just realized why the 36pro balked with solving d/dx (5000*(1-e^(-x/20))-200*x). It doesn't want to solve such a problem for a fractional power. It works like a champ when I make it
5000*(1-(20root e)^-x)-200*x. It solves for f(x)=0 as written originally, but doesn't work with fractional powers when solving for d/dx(f(x)=0.