Help with Logs

[momina4468]

I have these 8 problems that I have worked out and I was just wondering if someone can do them as well and see if they get the same anwers as me.

1. 5e^x = 23
Answer: x= ln4.6 or 1.526

2. (e^4x-5)-7=11243
Answer: x= (ln11250+5)/4 or 3.582

3. 3^x/7= .2
Answer : x= (ln.2/ln3) * 7 or -10.254

4. 5^2x+3=3^x-1
Answer: x= ln3/ln5 -4 or -3.317

5. (e^2x)-(2e^x)-3=0
ANswer: x= ln3 or 1.099

6. logsub4(x+5)=3
Answer: x=59

7. 6ln(2x)=30
Answer: not sure how to work it

8. ln sq rt(x+3)=1
Answer: x= e^2 -3 or x= 4.389

 

[Deleted member 4993]

I have these 8 problems that I have worked out and I was just wondering if someone can do them as well and see if they get the same anwers as me.

1. 5e^x = 23
Answer: x= ln4.6 or 1.526

2. (e^4x-5)-7=11243
Answer: x= (ln11250+5)/4 or 3.582

3. 3^x/7= .2
Answer : x= (ln.2/ln3) * 7 or -10.254

4. 5^2x+3=3^x-1
Answer: x= ln3/ln5 -4 or -3.317

5. (e^2x)-(2e^x)-3=0
ANswer: x= ln3 or 1.099

6. logsub4(x+5)=3
Answer: x=59

7. 6ln(2x)=30
Answer: not sure how to work it

8. ln sq rt(x+3)=1
Answer: x= e^2 -3 or x= 4.389

Please show us your work, indicating exactly where you are stuck - so that we know where to begin to help you.

 

[fasteddie65]

1. 5e^x = 23
Answer: x= ln4.6 or 1.526
That is correct.

2. (e^4x-5)-7=11243
Answer: x= (ln11250+5)/4 or 3.582
That's correct.

3. 3^x/7= .2
Answer : x= (ln.2/ln3) * 7 or -10.254
I got that after I realized you meant 3^(x/7) = .2

4. 5^2x+3=3^x-1
Answer: x= ln3/ln5 -4 or -3.317
(2x + 3) ln 5 = (x - 1) ln 3
I get x = -2.795...

5. (e^2x)-(2e^x)-3=0
ANswer: x= ln3 or 1.099
I agree.

6. logsub4(x+5)=3
Answer: x=59
Yes.

7. 6ln(2x)=30
Answer: not sure how to work it
ln (2x) = 5
2x = e^5
x = e^5/2 = 74.206...

8. ln sq rt(x+3)=1
Answer: x= e^2 -3 or x= 4.389
Yes.

 

[momina4468]

Thanks a lot fasteddie65. You actually did what I was asking for, not a lot of people usually do that . Now I feel more confident about my answers.

 

[mmm4444bot]

... You actually did what I was asking for, not a lot of people usually do that ...

Hello Momina:

I reviewed all of your posts at this site. In each instance where you have requested people to check your work, somebody has done so.

I do not understand the motivation for your comment.

If we are not meeting your expectations, then perhaps you will be more satisfied trying one of the following approaches.

Explicitly state that you desire only "yes" or "no" responses regarding the correctness of each answer you post for checking.

Send your exercises/answers list directly to Fast Eddie using the Private Message feature.

Cheers,

~ Mark :|

PS: Many of your typed expressions are ambiguous. Please read the information about how to use grouping symbols to properly type mathematical expressions. This information is found at the top of the page using the drop-down menu labeled "Forum Help". Select the item titled, "Karl's Notes - Typing Math".