x base b is b^x. It's the inverse of the logarithm.b^x = \exp(x \cdot \ln b).b > 0 and b ≠ 1. Common choices: b = 10, b = e, b = 2.10^{-3} = 0.001).b=10, then \log_{10}(b^x) = x; similarly \ln(b^x) = x\ln b.Choose which optional categories you allow. Necessary cookies are always on. Privacy Policy.