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- Logarithmic Functions

Still Confused?

Try reviewing these fundamentals first.

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Try reviewing these fundamentals first.

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Get Started Now- Lesson: 13:22
- Lesson: 2a2:18
- Lesson: 2b2:47

Basic concepts: Converting from logarithmic form to exponential form, Evaluating logarithms without a calculator, Common logarithms,

Related concepts: Logarithmic scale: Richter scale (earthquake), Logarithmic scale: pH scale, Logarithmic scale: dB scale,

• Definition of $``$natural logarithm$"$and mathematical constant $``$e$":$

1)Recall: common logarithms = log with base $``10"$example:$\log3 = \log_{10}3$

natural logarithms = log with base $``$e$"$ example:$\ln5 = \log_e5$

2)Like $``\pi"$, a mathematical constant equal to 3.14….., $``$e$"$is just another mathematical constant equal to 2.71…. .

3)Significance of $``\pi"$: we use it in circle calculations:

example: $area_{circle} = \pi r^2$ or $circumference_{circle} = 2 \pi r$

Significance of $``$e$"$: we use it mostly in calculus. $``$e$"$is a unique number such that the slope of tangent line at every point on the graph of $f(x) = e^x$ is equal to the y-value of the point.

1)Recall: common logarithms = log with base $``10"$example:$\log3 = \log_{10}3$

natural logarithms = log with base $``$e$"$ example:$\ln5 = \log_e5$

2)Like $``\pi"$, a mathematical constant equal to 3.14….., $``$e$"$is just another mathematical constant equal to 2.71…. .

3)Significance of $``\pi"$: we use it in circle calculations:

example: $area_{circle} = \pi r^2$ or $circumference_{circle} = 2 \pi r$

Significance of $``$e$"$: we use it mostly in calculus. $``$e$"$is a unique number such that the slope of tangent line at every point on the graph of $f(x) = e^x$ is equal to the y-value of the point.

- 1.Evaluate ln5a)by using the LOG key on a calculator.b)by using the LN key on a calculator.
- 2.Without using a calculator, evaluate:a)$\ln e$[useful rule:$\ln e = 1]$b)$e^{\ln500}$[useful rule: $e^{\ln a} = a]$

39.

Logarithmic Functions

39.1

What is a logarithm?

39.2

Converting from logarithmic form to exponential form

39.3

Evaluating logarithms without a calculator

39.4

Common logarithms

39.5

Natural log: ln

39.6

Evaluating logarithms using change-of-base formula

39.7

Converting from exponential form to logarithmic form

39.8

Solving exponential equations with logarithms

39.9

Product rule of logarithms

39.10

Quotient rule of logarithms

39.11

Combining product rule and quotient rule in logarithms

39.12

Evaluating logarithms using logarithm rules

39.13

Solving logarithmic equations

39.14

Graphing logarithmic functions

39.15

Finding a logarithmic function given its graph

We have over 2320 practice questions in ACCUPLACER Test Prep for you to master.

Get Started Now39.1

What is a logarithm?

39.2

Converting from logarithmic form to exponential form

39.3

Evaluating logarithms without a calculator

39.4

Common logarithms

39.5

Natural log: ln

39.6

Evaluating logarithms using change-of-base formula

39.7

Converting from exponential form to logarithmic form

39.8

Solving exponential equations with logarithms

39.9

Product rule of logarithms