DefinitionLogarithms have important properties such as the product rule logb(xy)=logb(x)+logb(y), the quotient rule logb(yx)=logb(x)−logb(y), and the power rule logb(xy)=ylogb(x) that provide us with tools for simplifying and manipulating complex logarithmic expressions. Examples: Employ the product rule, log(2⋅5)=log(2)+log(5)