Casio FX-82AU PLUS Calculator User Manual


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29
Logs, natural logs and
e
Thecalculatorusesgforlogbase10andhforlogbasee.Youdon’thaveto
rememberwhichbuttoniswhich.Allyouneedtodoislookatthesecondfunctionabove
eachbutton.ThegbuttonhasGaboveitremindingyouthatthegbuttonisbase
10.SimilarlythehbuttonhasHaboveit.hisbasee.
1 Useyourcalculatortoevaluateeachexpressioncorrectto3decimalplaces.
A
10
log 105
B
log 8
e
C
10
log 0.6
D
log 0.5
e
E
( )
10
log 4.3 2.5 ´
F
4log 209
e
2 A Enter
( )
log 1
e
-
intoyourcalculator.
B Explainwhyyourcalculatordisplaysthemessage“MathERROR”.
3 Yourcalculatorhastwoebuttons.Youcanfindthevalueof easthealpha
functiononK.Thevalueof e
x
canbedeterminedbyusingthesecondfunction
onh.
A Determinethevalueof eusingQ K p.Answerto4decimalplaces.
B Findthevalueof
3
e
to2decimalplaces bypressingSHIFTh3.
1. Determinethefollowingvaluescorrectto2decimalplaces.
A
2.5
e
B
1
e
-
C
e
4 Calculatethevaluesofthefollowingexpressions.
A
2
log
e
e
B
3
log
e
e
C
log
e
e
D
1
log
e
e
-
F
10
log 100
G
1
10
log 10
-
5 Whatisthevalueof
log
n
e
e
?(You’llhavetouseyourbrainforthisone!)
6 Evaluate
12
800
k
e
whenk=0.4.Expressyouranswertothenearesthundred.
7 Determinethevalueof
10
950
k
e
-
whenk=1.4.Expressyouranswerinscientific
notationwith3significantfigures.
8 Whatisthevalueof
e
p
?Expressyouranswerto2decimalplaces.
Answers
1A 2.021 B2.079 C
0.222 -
D
0.693 -
E 1.031 F21.369
2logxonlyexistsforx>0. 3A2.7183 B 20.09 4A12.18 B0.37 C 2.72
5A2 B3 C1 D 1 - E2 F 1 - 6 n 7 97200 8
4
7.90 10
-
´
98.54
©SueThomsonandShriroAustralia PTYLimited.Thispagemaybephotocopiedforclassroomuse.
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