# Problem with a 'simple' equation?

https://scontent-a-sin.xx.fbcdn.net/hphotos-xpf1/v/t1.0-9/q83/s720x720/960276_419358564889369_6107296607749832321_n.jpg?oh=848f1c866e20f0178f835cfec07b41b4&oe=555E6332

i = E/R + Ae^[-(RT)/L]

My problem is with the equation no. 2.
How do we get e^t/lamda when lamda = R/L? It should be e^t*lamda and where did the minus symbol go (the one in the power of e). And to equate i = i not it has to be (1 - e^t/lamda) = 1 and if t tends to infinity that's not possible in any way!

Please tell me where I am doing wrong! HELP!

The page has an error. Lambda should be L/R. The typography of the book puts a minus sign on the same level as the line for a fraction, so I think the exponent that looks like $\frac{t}{\lambda}$ is really $\frac{-t}{\lambda}$. To be correct, it should have the minus sign.