Day 12 Notes ­ Section 7.2 KJ W.notebook

February 04, 2015

7.2 ‐ Graphing Exponential Decay Functions

Parent Function for exponential decay:  y = bx   (where b is a fraction  between 0 and 1)

1

Day 12 Notes ­ Section 7.2 KJ W.notebook

To Graph: 

February 04, 2015

y = abx­h  + k

*same as growth functions*  Reminders:  ~ x = ­1,0,1 to start table  ~ Horizontal asymptote (determined by k value:  y = k)

y = (1/2)x

Parent Function: Asymptote: Domain: Range: End behavior: Transformations:

2

Day 12 Notes ­ Section 7.2 KJ W.notebook

February 04, 2015

y = 2(1/4)x Parent Function: Asymptote: Domain: Range: End behavior: Transformations:

y = 3(1/2)x+1  ­ 2

Parent Function: Asymptote: Domain: Range: End behavior: Transformations:

3

Day 12 Notes ­ Section 7.2 KJ W.notebook

February 04, 2015

Exponential Decay Model:  y = a(1 ­ r)t a =  y =  r =  t =  A new snowmobile costs $4200. The value of the snowmobile  decreases by 10% each year. a.  Write an exponential decay model giving the snowmobile's  value y (in dollars) after t years.

b. Find the value of the snowmobile after 3 years.

Example: A new television costs $1200.  The value of the television  decreases 21% each year. a)  Write an exponential decay model giving the value of  the television y (in dollars) after t years.

b)  Estimate the value of the television after 2 years.

4

Day 12 Notes ­ Section 7.2 KJ W.notebook

February 04, 2015

Example: A new television costs $1200.  The value of the television  decreases 21% each year. a)  Write an exponential decay model giving the value of  the television y (in dollars) after t years.

b)  Estimate the value of the television after 2 years.

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