4.5 and 4.1 Properties of Exponentials
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Transcript of 4.5 and 4.1 Properties of Exponentials
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Unit 4 – Exponential Functions Date: 4.5 Properties of Exponential Functions & 4.1 Investigating Growth and Decay
Homework: Complete Handout & Page 243: Question # 1&2 Learning Objectives/Success Criteria: At the end of this lesson I will be able to:
• Identify linear, quadratic and exponential functions from their graphs and equations • Describe basic properties of exponential functions including: domain, range, horizontal asymptote,
y-‐intercept, effect of b
Comparing Linear, Quadratic and Exponential Functions 1. Complete the following table for each function. Use additional values for x if you wish.
a) Circle the greatest y-‐value in each row in your table
b) Is there any x-‐value for which all three y-‐values are the same? If so, which value?
c) Which function seems to represent the slowest growth?
Why?
d) Which function seems to represent the fastest growth? Is this true for all x-‐values?
2. Complete the table of values for each of the following. y =2x y = x2 y =2x
x y F.D. x y F.D. x y F.D. 0 0 0 1 1 1 2 2 2 3 3 3 4 4 4 5 5 5
a) What does the first differences (F.D.) column indicate about y = x2 and y =2x ? Is there a constant rate
of change for either? b) Describe the sequence formed by the first differences for y = x2 . Explain. c) Describe the sequence formed by the first differences for y =2x . Explain.
x y =2x y = x2 y =2x 0 1 2 4 5 10 20
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Properties of Exponential Functions A basic exponential function is of the form y =a(bx ) , where:
• a is the initial value (for word problems) or the y-‐intercept (when b0 =1 ) • bx is the rate of increase or decrease
1. Graph the following exponential functions: y =2x , y =3x and y =5x Complete the table of values:
x -‐4 -‐3 -‐2 -‐1 0 1 2 3 4
y =2x
y =3x
y =5x
2. Plot each set of points on the same axes and draw the 3 curves.
a) What is is the value of the y-‐intercept for each function? b) What happens to the y-‐values in each function as the value of x increases? c) Which function rises faster? d) What happens to the value of y in each function as the value of x decreases? e) Which function decreases faster? f) Write a brief note about the x-‐intercepts. g) Write the domain and range for each function.
3. Graph the following exponential functions: y = 12!
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, y = 13!
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and y = 15!
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x
Complete the table of values: x -‐4 -‐3 -‐2 -‐1 0 1 2 3 4
y = 12!
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x
y = 13!
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x
y = 15!
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x
4. Plot each set of points on the same axes and draw the 3 curves.
a) What is is the value of the y-‐intercept for each function? b) What happens to the y-‐values in each function as the value of x increases? c) Which function rises faster? d) What happens to the value of y in each function as the value of x decreases? e) Which function decreases faster? f) Write a brief note about the x-‐intercepts. g) Write the domain and range for each function.