Warmup

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Warm-up
Expand
Condense
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8.4

• Logarithmic Functions Part 2

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The Change-of-Base Formula
Let u, b, and c be positive numbers with b ?1 and
c ?1 then
Original base
Why can b ?1 and c ?1 ?
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Why convert to a different base?

• Calculators can only evaluate common and natural
  logarithms. So it may be necessary to change the
  base before you can use your calculator.

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Example

• Evaluate the expression log3 7 using common and
  natural logarithms.

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Homework

• P. 497
• 58 72 Even