SOLUTION: Q: e^(2x+5)=40 its pretty simple i think, this is what i've figured out. ln(e^(2x+5))=ln(40) 2x+5=ln(40) 2x+5 = 3.688 2x = -2.688 x = -1.344 im not sure if thats right,

Algebra ->  Exponential-and-logarithmic-functions -> SOLUTION: Q: e^(2x+5)=40 its pretty simple i think, this is what i've figured out. ln(e^(2x+5))=ln(40) 2x+5=ln(40) 2x+5 = 3.688 2x = -2.688 x = -1.344 im not sure if thats right,      Log On


   



Question 152520: Q: e^(2x+5)=40
its pretty simple i think, this is what i've figured out.

ln(e^(2x+5))=ln(40)
2x+5=ln(40)
2x+5 = 3.688
2x = -2.688
x = -1.344
im not sure if thats right, i didnt really pay attention in logs,and e's.

Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Quickest way to check is to plug your solution into the equation and make sure it solves it.
e%5E%282x%2B5%29
e%5E%282%28-1.344%29%2B5%29
e%5E%28-2.688%2B5%29
e%5E%282.312%29
10.094
Oops, there's a problem.
You paid attention for logarithms but not during subtraction.
Your thinking and approach to the problem are clear.
ln%28e%5E%282x%2B5%29%29=ln%2840%29
2x%2B5=ln%2840%29
2x%2B5+=+3.688
2x+=+highlight%28-2.688%29
It should be,
2x+=+highlight%28-1.311%29
x+=+-0.656
Checking,
e%5E%282x%2B5%29
e%5E%282%28-0.656%29%2B5%29
e%5E%283.688%29
39.96
Close enough.