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xaby a≠0, b>0,b≠1, xєR
Exponential Growth Exponential Decay
(0,a) (0,a)
b > 1, b = _______________
a = __________________
H. Asymptote: y = ______
0 < b < 1, b = _______________
a = _________________
H. Asymptote : y = ______
growth factor decay factor
y-intercept on parent fcn y-intercept on parent fcn
0 0
NOTES DAY 8.1
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XX YY
-2-2 2/92/9
-1-1 2/32/3
00 22
11 66The “b” is NOT the
y-intercept in an exponential function
· 3
· 3
· 3
+1
+1
+1
“a” is the starting point and b is the product from one y-value to the next
Y = 2 · 3x
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XX YY
-2-2 125125
-1-1 2525
00 55
11 11
· 1/5
· 1/5
· 1/5
+1
+1
+1
The “a” is the starting point and so a = 5
y = 5 · (1/5)xThe b is the product, so b = 1/5
Where a≠0 0<b<1
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xaby
Causes a _________________ in the graph1a
10 a Causes a _________________ in the graph
0a Causes a _____________ in the x-axis
kaby hx
“h” causes a _______________________ in the graph
“k” causes a _______________________ in the graphVertical Translation
Vertical Shrink
Reflection
Horizontal Translation
Vertical Stretch
Parent:
Transformation:
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Y = a(1+r)t
a = initial amount
r = growth rate
t = time period
1+r = growth factorIf the rate is 3% , then
The decay model is the same except
the decay factor is 1 – r
1.03 is the growth factor
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You put $350 in a savings account that earns 3% annual interest compounded yearly. How much will that investment be worth in 4 years?
Y = a(1+r)t
Y = 350(1+0.03)4
Y ≈ $393.93 in 4 years
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Complete a t-chart
Domain:Range:Y-intercept:
X Y
-2 3/4
-1 3/2
0 3
1 6
2 12(-∞,∞)(0,∞)(0,3)
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Complete a t-chart
Domain:Range:H. Asymptote:
X Y
-2 9
-1 5
0 3
1 2
2 1.5(-∞,∞)(1,∞)Y=1
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Equation: xy )3(2400
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322 4
1
xx
44
4
1
322
xx
2)3(22 xx
9622 2 xxx
780 2 xx
}7,1{x
X=7
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1. 2. 3x = 27 3. 32X-1=27 X+2x2
8
1
x22 3
3x
333 x
3x
)2(3
33 )12(
x
x
6312 xx
x 7
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Activity: Now lets see what you know. I will show you some problems. When I ask for the answer, please show the color of the matching correct answer.
HW : WS 8.1
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A. x = 0B. y = 0C. x = 2D. y = 2
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A. Y = 3x+1 + 3B. Y = 3x-1 + 3C. Y = 3x+3 + 1D. y = 3x-3 +1
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A. Y = 3x+1 + 3B. Y = 3x-1 + 3C. Y = 3x+3 + 1D. y = 3x-3 + 1
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A. Translated up 1 unitB. Translated down 1 unitC. Reflected over the x-axisD. Reflected over the y-axis
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A. y=2(3)x
B. y=3(2)x
C. Y=2x3
D. y=3x2
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A. y=50(3)5
B. y=50(1.03)5
C. Y=3(50)5
D. y=1.03(50)5
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A. 2x+2=81/3B. 32x+2 =34
C. 9x+2 = 81D. 32x+2 = 92
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A. X = X-4B. 3x =3-2X+8
C. 3x = (32)X-4
D. X = 2X-4
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A. X-5 = 1B. 4x-5 = 43
C. 4x-5 = 4-3
D. X-5 = 64