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The logarithm is denoted "log b x" (pronounced as "the logarithm of x to base b", "the base-b logarithm of x", or most commonly "the log, base b, of x "). An equivalent and more succinct definition is that the function log b is the inverse function to the function x ↦ b x {\displaystyle x\mapsto b^{x}} .
The logarithm tells us what the exponent is! In that example the "base" is 2 and the "exponent" is 3: So the logarithm answers the question: What exponent do we need. (for one number to become another number) ? The general case is: Example: What is log10(100) ... ? 102 = 100. So an exponent of 2 is needed to make 10 into 100, and: log10(100) = 2.
A logarithm is the inverse of the exponential function. Specifically, a logarithm is the power to which a number (the base) must be raised to produce a given number. For example, \(\log_2 64 = 6,\) because \( 2^6 = 64.\) In general, we have the following definition: \( z \) is the base-\(x\) logarithm of \(y\) if and only if \( x^z = y \). In ...
Learn what logarithms are and how to evaluate them. Skip to main content If you're seeing this message, it means we're having trouble loading external resources on our website.
A logarithm tells us the power, y, that a base, b, needs to be raised to in order to equal x. This is written as: log b (x) = y. Example. Write the equivalent of 10 3 = 1000 using logarithms. Two of the most commonly used bases are base 10 (common logarithm) and base e (natural logarithm).
logarithm, the exponent or power to which a base must be raised to yield a given number. Expressed mathematically, x is the logarithm of n to the base b if bx = n, in which case one writes x = log b n. For example, 2 3 = 8; therefore, 3 is the logarithm of 8 to base 2, or 3 = log 2 8. In the same fashion, since 10 2 = 100, then 2 = log 10 100.
A logarithm answers the question "How many of this number do we multiply to get that number?" Example: How many 2s must we multiply to get 8? Answer: 2 × 2 × 2 = 8, so we had to multiply 3 of the 2s to get 8. We say the logarithm of 8 with base 2 is 3. In fact these two things are the same: Introduction to Logarithms.
