Logarithms: entering into calculators, solving eqns, etc

[pleasehelp989]

I do not understand logarithms AT ALL...any help would be greatly appreciated!

How do you put them in the calculator?

How do you solve problems like "log4 65 + log4 (x + 10) = 95"?

 

[skeeter]

Re: LOGARITHMS

i do not understand logarithms AT ALL...

then ... go HERE and begin your journey toward understanding.

 

[stapel]

I do not understand logarithms AT ALL

The reason "logarithms" were (almost certainly) an entire chapter in your textbook is because they cannot be covered in a quicky forum posting. If you are needing lessons, please consider using a search engine, which will turn up lessons such as the following:

Basic logs:

. . . . .The Math Page: Logarithms

. . . . .The Math Page: Logarithmic and Exponential Functions

. . . . .WTAMU: Logs Functions

. . . . .Ask Dr. Math: Logarithm Archive

. . . . .Paul's Notes: Logarithmic Functions

. . . . .Oak Road Systems: The Laws of Logarithms

. . . . .Logarithms

. . . . .Log Rules

Graphing logs:

. . . . .Media Mathematics: Exponential and Logarithm Graphs

. . . . .AnalyzeMath: Graphs of Logarithmic Functions

. . . . .Graphing Log Functions

Solving log equations:

. . . . .Algebra Lab: Solving Logarithmic Equations

. . . . .Some Techniques for Solving Exp'l and Log. Eqns

. . . . .Math for Morons Like Us: Exponential and Log Functions

. . . . .UNCWIL: Exponential and Logarithmic Equations

. . . . .Paul's Notes: Solving Logarithmic Equations

. . . . .Solving Log Equations

How do you put them in the calculator?

That will vary with the particular logarithmic expression and the particular calculator model. Please review your owner's manual.

How do you solve problems like "log4 65 + log4 (x + 10) = 95"?

Use log rules (links above) to combine the terms on the left-hand side into one log, and then convert to the corresponding exponential form (links above). Solve the resulting linear equation.

Eliz.