Exponential Functions Section 1.3. Exponential Functions f(x) = a x Example: y 1 = 2 x y 2 = 3 x y 3...

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Exponential Functions Section 1.3

Transcript of Exponential Functions Section 1.3. Exponential Functions f(x) = a x Example: y 1 = 2 x y 2 = 3 x y 3...

Page 1: Exponential Functions Section 1.3. Exponential Functions f(x) = a x Example: y 1 = 2 x y 2 = 3 x y 3 = 5 x For what values of x is 2 x

Exponential Functions

Section 1.3

Page 2: Exponential Functions Section 1.3. Exponential Functions f(x) = a x Example: y 1 = 2 x y 2 = 3 x y 3 = 5 x For what values of x is 2 x

Exponential Functions

f(x) = ax

Example:

y1 = 2x

y2 = 3x

y3 = 5x

For what values of x is 2x<3x<5x?

For what values of x is 2x>3x>5x?

For what values of x is 2x=3x=5x?

Page 3: Exponential Functions Section 1.3. Exponential Functions f(x) = a x Example: y 1 = 2 x y 2 = 3 x y 3 = 5 x For what values of x is 2 x

Important Concepts• Exponent rules• Half-life: the amount of time it takes for half

of a radioactive substance to change from its original state to a nonradioactive state by emitting energy in the form of radiation

• Exponential growth and decay

y = kax

(Growth if a > 1, decay if 0 < x < 1)

Page 4: Exponential Functions Section 1.3. Exponential Functions f(x) = a x Example: y 1 = 2 x y 2 = 3 x y 3 = 5 x For what values of x is 2 x

Important Concepts• e: the number that the function given below

approaches as x approaches infinity

• e is commonly used with models of exponential growth or decay

• Example: Interest compounded continuously

y = Pert

f (x) 11

x

x

Page 5: Exponential Functions Section 1.3. Exponential Functions f(x) = a x Example: y 1 = 2 x y 2 = 3 x y 3 = 5 x For what values of x is 2 x

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