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katymichellexx
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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)
 one year ago
 one year ago
katymichellexx Group Title
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)
 one year ago
 one year ago

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geoffb Group TitleBest ResponseYou've already chosen the best response.1
What do you know about logs and what they *can't* be used to calculate?
 one year ago

katymichellexx Group TitleBest ResponseYou've already chosen the best response.0
I'm confused about the part about rejecting values of x that are not in the domain.
 one year ago

katymichellexx Group TitleBest ResponseYou've already chosen the best response.0
How 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.
 one year ago

katymichellexx Group TitleBest ResponseYou've already chosen the best response.0
I am using MyMathLab so it's very sensitive, and I have to put in the exact correct answer
 one year ago

geoffb Group TitleBest ResponseYou've already chosen the best response.1
Can you take a log of a negative number?
 one year ago

geoffb Group TitleBest ResponseYou've already chosen the best response.1
Good. And what about 0?
 one year ago

geoffb Group TitleBest ResponseYou've already chosen the best response.1
Perfect. So you know, then, that each of your logs have to be > 0. That's the limitation of your domain.
 one year ago

katymichellexx Group TitleBest ResponseYou've already chosen the best response.0
I put in x=8 on my MathLab and got it right! You made it so easy for me, thank you!
 one year ago

geoffb Group TitleBest ResponseYou've already chosen the best response.1
Yes, it is 8, but I want to make sure you know why.
 one year ago

katymichellexx Group TitleBest ResponseYou've already chosen the best response.0
x^24x+8x32=4^3 x^2+4x32=64 64 64 x^2+4x96=0 x8=0 x+12=0 x=8 x=12
 one year ago

geoffb Group TitleBest ResponseYou've already chosen the best response.1
Oh, good! Nice job.
 one year ago

katymichellexx Group TitleBest ResponseYou've already chosen the best response.0
(8)^24(8)32=0 643232=0 0=0
 one year ago

katymichellexx Group TitleBest ResponseYou've already chosen the best response.0
Thanks. I know how to get there, just not which X to use
 one year ago
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