# Exponential And Logarithmic Functions Alvaro Hurtado

884 words - 4 pages

A function is a relation in which each element of the domain is paired with exactly one element in the range. Two types of functions are the exponential functions and the logarithmic functions. Exponential functions are the functions in the form of y = ax, where ''a'' is a positive real number, greater than zero and not equal to one. Logarithmic functions are the inverse of exponential functions, y = loga x, where ''a'' is greater to zero and not equal to one. These functions have certain differences as well as similarities between them. Also they are very useful for various situations in life.Logarithmic functions are fairly different from the exponential functions. The first difference that we can find between them is in the equations, they are inverse to each other. The logarithmic equation is y = loga x and the exponential equation is y = ax. We can also see that the natural exponential function is different form the natural logarithmic function. The natural exponential function is y = f(x) = ex and the natural logarithmic function is f(x) = loge x = lnx , where x > 0. Also we can see that to graph and exponential function it always has to pass through the point (0,1).However, both of these functions also have similarities. Both of the functions contain an ''a'' which has to be greater than zero and less than one. Also when we graph both of the functions we can see that they will never touch an axis because of the rule that ''a'' is greater than zero and less than one. To solve exponential functions, you use the same rules set of rules that you use to solve logarithmic functions. (logamn = loga m + loga n, logam / n = loga m - loga n, loga m = p x loga m, If loga m = loga n, then m = n. Where m and n are positive number, b is any positive number rather than one and p is any real number.) Also both of the functions have a base which is the ''a.'' This are some of the similarities that we can see from the equations.Logarithmic and exponential functions are very useful for many situations in real life. Exponential functions are used to estimate and graph topics that have to do with growth or any type of data that deals with an increase. For example is used to describe and graph the population of a country and its rapid change. Also it can be used to explain the exponential growth of almost anything. Logarithmic functions are also useful to calculate the interests you gain in a bank. Both of these functions are most commonly applied in finding the interest earned on an investment, population growth and carbon dating.In conclusion we can see that even though the...

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