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Log 81 (21)

Log 81 (21) is the logarithm of 21 to the base 81:

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Result:
Simply the Best Logarithm Calculator! Click To Tweet As you can see in our log calculator, log81 (21) = 0.69281093729036.

Calculate Log Base 81 of 21

To solve the equation log 81 (21) = x carry out the following steps.
  1. Apply the change of base rule:
    log a (x) = log b (x) / log b (a)
    With b = 10:
    log a (x) = log(x) / log(a)
  2. Substitute the variables:
    With x = 21, a = 81:
    log 81 (21) = log(21) / log(81)
  3. Evaluate the term:
    log(21) / log(81)
    = 1.39794000867204 / 1.92427928606188
    = 0.69281093729036
    = Logarithm of 21 with base 81
Here’s the logarithm of 81 to the base 21.

Additional Information

  • From the definition of logarithm b y = x ⇔ y = log b(x) follows that 81 0.69281093729036 = 21
  • 81 0.69281093729036 = 21 is the exponential form of log81 (21)
  • 81 is the logarithm base of log81 (21)
  • 21 is the argument of log81 (21)
  • 0.69281093729036 is the exponent or power of 81 0.69281093729036 = 21
BTW: Logarithmic equations have many uses in various contexts in science.

Frequently searched terms on our site include:

FAQs

What is the value of log81 21?

Log81 (21) = 0.69281093729036.

How do you find the value of log 8121?

Carry out the change of base logarithm operation.

What does log 81 21 mean?

It means the logarithm of 21 with base 81.

How do you solve log base 81 21?

Apply the change of base rule, substitute the variables, and evaluate the term.

What is the log base 81 of 21?

The value is 0.69281093729036.

How do you write log 81 21 in exponential form?

In exponential form is 81 0.69281093729036 = 21.

What is log81 (21) equal to?

log base 81 of 21 = 0.69281093729036.
For further questions about the logarithm equation, common logarithms, the exponential function or the exponential equation fill in the form at the bottom.

Summary

In conclusion, log base 81 of 21 = 0.69281093729036.

You now know everything about the logarithm with base 81, argument 21 and exponent 0.69281093729036.
Further information, particularly about the binary logarithm, natural logarithm and decadic logarithm can be located in our article logarithm.

Besides the types of logarithms, there, we also shed a light on the terms on the properties of logarithms and the logarithm function, just to name a few.
Thanks for visiting Log81 (21).

Table

Our quick conversion table is easy to use:
log 81(x) Value
log 81(20.5)=0.68732730311212
log 81(20.51)=0.68743828083032
log 81(20.52)=0.68754920445263
log 81(20.53)=0.68766007403176
log 81(20.54)=0.68777088962034
log 81(20.55)=0.68788165127094
log 81(20.56)=0.68799235903603
log 81(20.57)=0.68810301296802
log 81(20.58)=0.68821361311924
log 81(20.59)=0.68832415954194
log 81(20.6)=0.6884346522883
log 81(20.61)=0.68854509141042
log 81(20.62)=0.68865547696032
log 81(20.63)=0.68876580898995
log 81(20.64)=0.68887608755119
log 81(20.65)=0.68898631269582
log 81(20.66)=0.68909648447559
log 81(20.67)=0.68920660294212
log 81(20.68)=0.68931666814701
log 81(20.69)=0.68942668014173
log 81(20.7)=0.68953663897772
log 81(20.71)=0.68964654470633
log 81(20.72)=0.68975639737882
log 81(20.73)=0.68986619704641
log 81(20.74)=0.68997594376021
log 81(20.75)=0.69008563757128
log 81(20.76)=0.6901952785306
log 81(20.77)=0.69030486668906
log 81(20.78)=0.69041440209751
log 81(20.79)=0.6905238848067
log 81(20.8)=0.69063331486731
log 81(20.81)=0.69074269232996
log 81(20.82)=0.69085201724518
log 81(20.83)=0.69096128966344
log 81(20.84)=0.69107050963513
log 81(20.85)=0.69117967721058
log 81(20.86)=0.69128879244003
log 81(20.87)=0.69139785537366
log 81(20.88)=0.69150686606157
log 81(20.89)=0.69161582455379
log 81(20.9)=0.69172473090028
log 81(20.91)=0.69183358515094
log 81(20.92)=0.69194238735557
log 81(20.93)=0.69205113756393
log 81(20.94)=0.69215983582568
log 81(20.95)=0.69226848219044
log 81(20.96)=0.69237707670773
log 81(20.97)=0.69248561942701
log 81(20.98)=0.69259411039767
log 81(20.99)=0.69270254966904
log 81(21)=0.69281093729036
log 81(21.01)=0.69291927331081
log 81(21.02)=0.6930275577795
log 81(21.03)=0.69313579074546
log 81(21.04)=0.69324397225768
log 81(21.05)=0.69335210236504
log 81(21.06)=0.69346018111637
log 81(21.07)=0.69356820856044
log 81(21.08)=0.69367618474593
log 81(21.09)=0.69378410972147
log 81(21.1)=0.69389198353561
log 81(21.11)=0.69399980623682
log 81(21.12)=0.69410757787353
log 81(21.13)=0.69421529849408
log 81(21.14)=0.69432296814674
log 81(21.15)=0.69443058687972
log 81(21.16)=0.69453815474117
log 81(21.17)=0.69464567177916
log 81(21.18)=0.69475313804168
log 81(21.19)=0.69486055357667
log 81(21.2)=0.694967918432
log 81(21.21)=0.69507523265547
log 81(21.22)=0.69518249629482
log 81(21.23)=0.6952897093977
log 81(21.24)=0.69539687201172
log 81(21.25)=0.6955039841844
log 81(21.26)=0.6956110459632
log 81(21.27)=0.69571805739553
log 81(21.28)=0.69582501852872
log 81(21.29)=0.69593192941001
log 81(21.3)=0.69603879008662
log 81(21.31)=0.69614560060567
log 81(21.32)=0.69625236101422
log 81(21.33)=0.69635907135928
log 81(21.34)=0.69646573168776
log 81(21.35)=0.69657234204654
log 81(21.36)=0.69667890248242
log 81(21.37)=0.69678541304213
log 81(21.38)=0.69689187377233
log 81(21.39)=0.69699828471963
log 81(21.4)=0.69710464593057
log 81(21.41)=0.69721095745161
log 81(21.42)=0.69731721932917
log 81(21.43)=0.69742343160958
log 81(21.44)=0.69752959433913
log 81(21.45)=0.69763570756402
log 81(21.46)=0.69774177133041
log 81(21.47)=0.69784778568437
log 81(21.48)=0.69795375067192
log 81(21.49)=0.69805966633902
log 81(21.5)=0.69816553273156

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