Log b c 1 log c b Logarithm change of base rule. Normally you see exponents written as such and attached to the number being raised to that exponent called the base. The base b logarithm of x is base c logarithm of x divided by the base c logarithm of b.
In other words the logarithm of y to base b is the exponent we must raise b to in order to get y as the result.
Find the logarithm with base 10 of number 2. Or the base-2 log of 8 is 3. The base b logarithm of x is base c logarithm of x divided by the base c logarithm of b. Before you can solve the logarithm you need to shift all logs in the equation to one side of the equal sign.