Lesson plan

Define a logarithm as the inverse of an exponential function by modeling a situation with an unknown exponent

teaches Common Core State Standards CCSS.Math.Content.HSF-BF.B.5 http://corestandards.org/Math/Content/HSF/BF/B/5

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Big Ideas: The inverse of an exponential function is the logarithm. In this task students are given linear and exponential functions and asked to determine the domain values that yield specific range values. This helps students to understand that for an exponential function, special notation is needed to represent the inverse. This serves as an introduction to log notation, and defines the logarithm as the inverse of an exponential. Vocabulary: exponential function, inverse function, logarithm Special Materials: Graph paper (optional) Calculator