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Write the expression as a logarithm of a single expression.

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1 Answer

Hi Keith;
Should we begin with the + or -.
Let's remember the algebraic order of operations...
Parentheses
Exponential
Multiplication
Division
Addition
Subtraction
The acronym for this is PEMDAS...Please excuse my Dear Aunt Sally.
The Aunt (addition) comes before Sally (subtraction).
We will begin with addition.
Log 5 + Log 8 - Log 4 = Log ?
log 5 + log 8
Let's apply the principle...
log ab=log a + log b
log [(5)(8)]
log 40
log 40 - log 4
Let's apply the principle...
log a/b=log a - log b
log (40/4)
log 10

Comments

Parviz is correct.  I forgot that detail.  Sorry!