EXPONENTIAL AND LOG FUNCTIONS

[pgotm]

5^2x-1=400
ln 5^2x-1=ln 400
(2x-1)ln 5=ln 400
2xln5-ln5=ln400
2xln5=ln400-ln5
x=ln 400-ln 5 over 2 ln 5
I got 1.3613 but that was wrong, can someone nudge me in the right direction? Thanks for your time!

 

[galactus]

You subtracted ln(5) from both sides. You should add it.