Question

Approximate: log
1
2
5


2.3219

–0.4307

–2.3219

0.4307

Answer 1

Here are the useful approximations and their relations:

- log2(5) ≈ 2.3219
- log5(2) = 1 / log2(5) ≈ 0.4307
- log2(1/5) = −log2(5) ≈ −2.3219
- log5(1/2) = −log5(2) ≈ −0.4307

(You can get any of these from log2(5) using change-of-base and reciprocal/negation rules.)