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Question: Evaluate/death stare at [tex]log_{\frac{1}6}(5)[/tex].
Let's talk about what logarithms mean.
Suppose [tex]log_{\frac{1}6}(5)=x[/tex].
That's the same thing as [tex]5=(\frac{1}6)^x[/tex]. It's just been simplified.
(Logarithms are the inverse operations of exponents)
We can use a calculator to evaluate logarithms that are in base 10.
(In this case, the base is 1/6)
How can we change this so that it uses just base 10?
We can use something called the change-of-base formula.
Here's what the change of base formula looks like.
[tex]log_x(n)=\frac{log_y(n)}{log_y(x)}[/tex]
In this case, we'll set the base [tex]y[/tex] to be 10. (you can set it to whatever you want) [tex]x[/tex] is going to be 1/6, and [tex]n[/tex] is 5.
When the base is 10, we don't have to write it, it's like a plus zero or a times one.
[tex]log_\frac{1}6(5)=\frac{log(5)}{log(\frac{1}6)}[/tex]
Punch this into a calculator to find your answer.
[tex]\frac{log(5)}{log(\frac{1}6)} \approx \boxed{-0.8982444017}[/tex]
You can always check your answer if you need to, of course.
[tex](\frac{1}6)^{-0.8982444017} \approx 5[/tex]
Let's talk about what logarithms mean.
Suppose [tex]log_{\frac{1}6}(5)=x[/tex].
That's the same thing as [tex]5=(\frac{1}6)^x[/tex]. It's just been simplified.
(Logarithms are the inverse operations of exponents)
We can use a calculator to evaluate logarithms that are in base 10.
(In this case, the base is 1/6)
How can we change this so that it uses just base 10?
We can use something called the change-of-base formula.
Here's what the change of base formula looks like.
[tex]log_x(n)=\frac{log_y(n)}{log_y(x)}[/tex]
In this case, we'll set the base [tex]y[/tex] to be 10. (you can set it to whatever you want) [tex]x[/tex] is going to be 1/6, and [tex]n[/tex] is 5.
When the base is 10, we don't have to write it, it's like a plus zero or a times one.
[tex]log_\frac{1}6(5)=\frac{log(5)}{log(\frac{1}6)}[/tex]
Punch this into a calculator to find your answer.
[tex]\frac{log(5)}{log(\frac{1}6)} \approx \boxed{-0.8982444017}[/tex]
You can always check your answer if you need to, of course.
[tex](\frac{1}6)^{-0.8982444017} \approx 5[/tex]
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