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 2 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)
 2 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)

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

katymichellexx
 2 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.

katymichellexx
 2 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.

katymichellexx
 2 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

geoffb
 2 years ago
Best ResponseYou've already chosen the best response.1Can you take a log of a negative number?

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

katymichellexx
 2 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!

geoffb
 2 years ago
Best ResponseYou've already chosen the best response.1Yes, it is 8, but I want to make sure you know why.

katymichellexx
 2 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

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

katymichellexx
 2 years ago
Best ResponseYou've already chosen the best response.0Thanks. I know how to get there, just not which X to use
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