15c SOLVE question on usage

[Visu]

SOLVE might not be that efficient for such simple equations. Because it uses Newton's alogrithm, and to make it is effecient you may want to enter two approximations of the result, you're better off creating 3 small routines in A, B C where LBL A E = I*R, LBL B R = E/I, ... you get the picture.

Now if you're talking of more complex esuqtions, including powers, trigs or logs, then SOLVE is really a good tool.

Enoy your 15C !