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Graphing Logarithmic Functions
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Algebra 2
Exponential and Logarithmic Functions
Graphing Logarithmic Functions
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Graphing Logarithmic Functions 1.5 - Solution
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Return to Graphing Logarithmic Functions
a
In order to determine
f
(
3
)
,
substitute
x
=
3
into the function and calculate.
f
(
x
)
=
4
e
x
/
3
Substitute
x
=
3
f
(
3
)
=
4
e
3
/
3
CalcQuot
Calculate quotient
f
(
3
)
=
4
e
1
UseCalc
Use a calculator
f
(
3
)
=
1
0
.
8
7
3
1
2
…
RoundSigDig
Round to
2
significant
digits
{\textstyle \ifnumequal{2}{1}{\text{digit}}{\text{digits}}}
f
(
3
)
≈
1
1
b
In the same way, substitute
x
=
3
into the function and calculate.
f
(
x
)
=
ln
(
1
2
x
)
Substitute
x
=
3
f
(
3
)
=
ln
(
1
2
3
)
UseCalc
Use a calculator
f
(
3
)
=
-
1
.
3
8
6
2
9
…
RoundSigDig
Round to
2
significant
digits
{\textstyle \ifnumequal{2}{1}{\text{digit}}{\text{digits}}}
f
(
3
)
≈
-
1
.
4
