A community for students.
Here's the question you clicked on:
 0 viewing
anonymous
 4 years ago
Solve the logarithmic equation. Be sure to reject and value of x that is not in the domain of the original logarithmic expression. Give the exact answer. log4(x+8)+log4(x4)=3 (the 4 after the logs are subscript)
anonymous
 4 years ago
Solve the logarithmic equation. Be sure to reject and value of x that is not in the domain of the original logarithmic expression. Give the exact answer. log4(x+8)+log4(x4)=3 (the 4 after the logs are subscript)

This Question is Closed

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0What do you know about logs and what they *can't* be used to calculate?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0I'm confused about the part about rejecting values of x that are not in the domain.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0How do I know which value of x to use? When I take my x values and plug them back into the equation, more than one x value fits and makes everything come out correctly but I am unsure about which one to put down for answer.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0I am using MyMathLab so it's very sensitive, and I have to put in the exact correct answer

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Can you take a log of a negative number?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Good. And what about 0?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Perfect. So you know, then, that each of your logs have to be > 0. That's the limitation of your domain.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0I put in x=8 on my MathLab and got it right! You made it so easy for me, thank you!

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Yes, it is 8, but I want to make sure you know why.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0x^24x+8x32=4^3 x^2+4x32=64 64 64 x^2+4x96=0 x8=0 x+12=0 x=8 x=12

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0(8)^24(8)32=0 643232=0 0=0

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Thanks. I know how to get there, just not which X to use
Ask your own question
Sign UpFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.