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Logarithms can be used to make calculations easier. For example, two numbers can be multiplied just by using a logarithm table and adding. These are often known as logarithmic properties, which are documented in the table below. [2] . The first three operations below assume that x = bc and/or y = bd, so that logb(x) = c and logb(y) = d.
We summarize the Properties of Logarithms here for easy reference. While the natural logarithms are a special case of these properties, it is often helpful to also show the natural logarithm version of each property.
The 3 important properties of logarithms are: log mn = log m + log n log (m/n) = log m - log n log m n = n log m log 1 = 0 irrespective of the base. Logarithmic properties are used to expand or compress logarithms.
(a) 2x = 4.1 (b) 3x = 9.1 (c) 2 3x = 53 (d) 41 – 10 3x = 23 2.3 Properties of the common logarithm The graph of the common logarithm function y = log x is similar to the graph of the natural logarithm y = ln x. It is the reflection of the graph of the graph of y = 10x across the line y = x.
5.4 Properties of Logarithms In Section 5.3, we introduced the logarithmic functions as inverses of exponential functions and discussed a few of their functional properties from that perspective. In this section, we explore the algebraic properties of logarithms.
In this section, three very important properties of the logarithm are developed. These properties will allow us to expand our ability to solve many more equations. We begin by assigning u and v to the following logarithms and then write them in exponential form: logbx = u bu = x logby = v bv = y.