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This module provides practice problems related to logarithms.

log 2 8 asks the question: “2 to what power is 8?” Based on that, you can answer the following questions:

Looking at your answers to exercises #3-6, what does the log 10 tell you about a number?

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Multiple choice: which of the following is closest to log 10 500 ?

  • 1
  • 1 1 2
  • 2
  • 2 1 2
  • 3
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5 log 5 4 size 12{5 rSup { size 8{"log" rSub { size 6{5} } 4} } } {} =

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OK. When I say 36 size 12{ sqrt {"36"} } {} = 6 , that’s the same thing as saying 6 2 = 36 . Why? Because 36 size 12{ sqrt {"36"} } {} asks a question: “What squared equals 36?” So the equation 36 size 12{ sqrt {"36"} } {} = 6 is providing an answer: “ six squared equals 36.”

You can look at logs in a similar way. If I say log 2 32 = 5 I’m asking a question: “2 to what power is 32?” And I’m answering: “two to the fifth power is 32.” So saying log 2 32 = 5 is the same thing as saying 2 5 = 32 .

Based on this kind of reasoning, rewrite the following logarithm statements as exponent statements.

Now do the same thing backward: rewrite the following exponent statements as logarithm statements.

Finally...you don’t understand a function until you graph it...

  • Draw a graph of y = log 2 x . Plot at least 5 points to draw the graph.
  • What are the domain and range of the graph? What does that tell you about this function?
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Source:  OpenStax, Advanced algebra ii: activities and homework. OpenStax CNX. Sep 15, 2009 Download for free at http://cnx.org/content/col10686/1.5
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