1. The problem statement, all variables and given/known data http://desmond.imageshack.us/Himg191/scaled.php?server=191&filename=daumequation13325015229.png&res=medium [Broken] where A,B,C & D are constants. 2. The attempt at a solution Actually i am an electrical engineering student and these 2 equations are transistor equations that we are supposed to itterate in many problems, i tried to solve them but unfortunatley we were never actually taught how to solve Ln equations, so i'd be thankful if someone could solve them so i dont have to itterate them everytime because it's very time consuming and we've got so much work to do. Thanks in advance !