Find the exact solution ( I keep getting the wrong answer apparently):

4 ln (4x+8)=18.

I divide by 4 so :
ln(4x+8) = 18/4

then I do,

e^(18/4) = 4x +8 and then well I just solve for x which gives me 20.5. However I am doing something wrong which I don't know where :/

Question

Find the exact solution ( I keep getting the wrong answer apparently):

4 ln (4x+8)=18.

I divide by 4 so :
ln(4x+8) = 18/4 

then I do,
 
e^(18/4) = 4x +8 and then well I just solve for x which gives me 20.5. However I am doing something wrong which I don't know where :/

anonymous · Answer

so far, your procedure is correct.....
in the end, what is the expression you entered for x?

anonymous · Answer

Your work looks correct to me, maybe try carrying out a few more decimal places.

anonymous · Answer

It says do not give a decimal approximation (  its on an online website for review because I just started cal 1 ) but i entered 20.5, 20 and 21 . Time to ask the teacher. God i hate technology.thank you guys though

anonymous · Answer

$\large x=\frac{e^{9/2}-8}{4} $

that should be the expression....

anonymous · Answer

ahhhhh Thats what it meant. I'm sorry. Haven't done that in over a year. Thank you

anonymous · Answer

yw... 
yeah... exact form means to write it out without using your calculator's decimal approximation......