We cannot take a logarithm of
?
a negative number or zero
a fraction
a variable expression
.
After solving a logarithmic equation, we must check for
?
extraneous solutions
irrational numbers
.
If an equation contains more than one log, we must first combine them into
?
a common denominator
a single logarithm
.
If there is only one log involved, we write the equation in
?
standard
general
exponential
point-slope
form.