4.2 logarithmic functions date rewrite each equation in ...mrcobb.net/mac 1105/lecture notes/chapter...
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MAC ].]05 - College Algebra
4.2 Logarithmic Functions
Rewrite each equation in exponential form.
I) log 3 243 ::::5
3) log b:::: 16\-·0
5) log x =-]'- .1"
Name
1
2) log 121 11:::: 2
4) log4 176=b
6) log a:::: b'- c
"•.. ...1.. .••.
Date
Rewrite each equation in logarithmic form.
7) 73 = 343
9) y' = 105 10) 17P = 87
II) y' = 96
;::X
12) nm = 22
~..2 ~..
Evaluate each expression.
13) log} 81 :: y
3 'J~gl
3'$::6'1
ffi1
17) log7 343 :;;. 0t ~= 3'1]>
"1 ~.::-J3
rd ~3
I14) log 7 49
16) log} 243
I18) log6 36
-3 -
Evaluate the expression without using a calculator.
19) log44 :c= J
22) log9' =
23) Slog, 21" zl 24) 61og,45 --
--4-
11
25) log,,3 I ,
LOd3 ~
11 . I Uj3 3>
II . I
0J
-J26) fog J 31U
Identify the domain and range of each. Then sketch the graph.
27) y = log (x - 1) 28) y = log (x - 1) - 1
L
1.1
-5-
29) y =;:: In (x - I) + 4
3]) y=log4 (x+4)-2 l)"'")' .'1{"\
30) y = In (x + 6) + 3
•
32) y= logs (x-2)-2
-6 -
Evaluate each expression.
33) log .• 16'2.
LA?d~~
2- . tOe).., ~ .
'2.{
iB35) log 7 49
'2..
L08? 1
2. .l 0 ~=1:j
2· I
\iJ
37) log, 81.'
~
If)d~ ~
If .loU >3
LJ·'
JD
34) log4 64
36) log, 243.'
38) log 5 25
-']-
39) log: 64
~4 ~r)2.Z
t,.IO.j/o ·1
/1]
40) log 6 36
Use a calculator to approximate each to the nearest thousandth.
4]) log 10
43) log 10,000.000
42) log 48
I44) log 1000000
- 8-
I45) lof!, 100
.•.2-
lOQ 100'0
-2rloalO,0
-2.- .. (
13
46) log 10,000
Use a calculator to approximate each to the nearest thousandth.
949) lne
~. /Y\ e'1- I
ffJ
47) In 9 :::. 2. I 7 t 2 2 'tJ':;1 .. ·
~/~n-l
Evaluate the expression without using a calculator.Of
.Jfl.... I D, e e
48) In 47
50) lne
--9-
51) 1111
8/53) In'\le
I V} eY~
t ·J~ e
g ./
ill
e
1
52) In-----:;e
54) In-{;
56) e In 296