Two phase decay equation solution

1. Dec 27, 2011

sherif1980

Hello,

Does anyone know how to solve an equation of the form:

e-ax+e-bx=c

Where a,b and c are constants?

This left side of the equation represents the sum of two exponential decay processes, one fast and one slow. I want to know for what positive value of x the expression on the left side of the equation will decay to the constant c.

Thanks!

Sherif

2. Dec 28, 2011

daveb

Normally, if you have two separate decay processes occurring at the same time, you don't add the expression. Instead, you add the exponents.