Exponential Functions. Objectives To use the properties of exponents to:  Simplify exponential expressions.  Solve exponential equations. To sketch.

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Presentation transcript:

Exponential Functions

Objectives To use the properties of exponents to:  Simplify exponential expressions.  Solve exponential equations. To sketch graphs of exponential functions.

Exponential Functions A polynomial function has the basic form: f (x) = x 3 An exponential function has the basic form: f (x) = 3 x An exponential function has the variable in the exponent, not in the base. General Form of an Exponential Function: f (x) = N x, N > 0

Properties of Exponents

Simplify: Simplify:

Properties of Exponents Simplify:

Exponential Equations Solve:Solve:

Solve:Solve:

Not considered an exponential equation, because the variable is now in the base. Solve:Solve:

Exponential Equations Not considered an exponential equation, because the variable is in the base. Solve:

Exponential Functions General Form of an Exponential Function: f (x) = N x, N > 0 g(x) = 2 x x 2x2x2x2x g(3) = g(2) = g(1) = g(0) = g(–1) = g(–2) =

Exponential Functions g(x) = 2 x

Exponential Functions h(x) = 3 x x –1 –2

Exponential Functions h(x) = 3 x

Exponential Functions’ Graphs Exponential functions with positive bases greater than 1 have graphs that are increasing. The function never crosses the x -axis because there is nothing we can plug in for x that will yield a zero answer. The x -axis is a left horizontal asymptote. h(x) = 3 x (red) g(x) = 2 x (blue)

Exponential Functions’ Graphs A smaller base means the graph rises more gradually. A larger base means the graph rises more quickly. Exponential functions will not have negative bases. h(x) = 3 x (red) g(x) = 2 x (blue)

Exponential Functions

The Number e

Compute: x –.1 –.01 – x

The Number e e 

The Exponential Function f (x) = e x

Exponential Functions x –1 –2

Exponential Functions Exponential functions with positive bases less than 1 have graphs that are decreasing.

Why study exponential functions? Exponential functions are used in our real world to measure growth, interest, and decay. Growth obeys exponential functions. Ex: rumors, human population, bacteria, computer technology, nuclear chain reactions, compound interest Decay obeys exponential functions. Ex: Carbon-14 dating, half-life, Newton’s Law of Cooling