Log of 81 (Base 10)
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What is log 81?
Answer
log 81 ≈
1.9085
log here is the common log, base 10.
≈ — the logarithm is irrational; the value is rounded to 4 decimal places.
log 81 is the power you raise 10 to, to get 81: 10y = 81.
10¹ = 10 < 81 < 100 = 10², so 1 < log 81 < 2
log 81 = ln 81 / ln 10 ≈ 4.394449 / 2.302585 ≈ 1.9085
Answer point ≈ (81, 1.9085).
The curve y = log x passes through (1, 0) and (10, 1) and rises: for x > 1 the log is positive, for 0 < x < 1 negative.
| Base | Notation | Value |
|---|---|---|
| e | ln 81 | ≈ 4.3944 |
| 10 | log 81 | ≈ 1.9085 |
| 2 | log₂ 81 | ≈ 6.3399 |
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See Also
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