NAME DATE PERIOD Lesson 3 Skills Practice - Homestead Middle School
NAME _____________________________________________ DATE __________________ PERIOD _________
Lesson 3 Skills Practice
Functions
Find each function value.
1. f(2) if f(x) = x + 4 6
2. f(9) if f(x) = x - 8 1
3. f(3) if f(x) = 2x + 2 8
4. f(6) if f(x) = 2x - 5 7 5. f(-7) if f(x) = 3x + 6 -15 6. f(8) if f(x) = 3x - 10 14
7. f(-5) if f(x) = 4x + 2 -18 8. f(-3) if f(x) = -4x - 4 8 9. f(-4) if f(x) = -5x - 3 17
Copyright ? The McGraw-Hill Companies, Inc. Permission is granted to reproduce for classroom use.
Choose four values for x to make a function table for each function. Then state the domain and range of the function.
10. f(x) = x + 7
Sample answer:
11. f(x) = x - 13
Sample answer:
12. f(x) = 2x + 8
Sample answer:
x x + 7 f(x)
-1 -1 + 7 6 0 0+7 7 1 1+7 8 2 2+7 9
Domain: {-1, 0, 1, 2} Range: {6, 7, 8, 9}
13. f(x) = 2x - 3
Sample answer:
x x - 13 f(x)
x 2x + 8 f(x)
-2 -2 - 13 -15
-3 2(-3) + 8 2
-1 -1 - 13 -14
-1 2(-1) + 8 6
2 2 - 13 -11
0 2(0) + 8 8
3 3 - 13 -10
4 2(4) + 8 16
Domain: {-2, -1, 2, 3} Domain: {-3, -1, 0, 4}
Range: {-15, -14,
Range: {2, 6, 8, 16}
-11, -10}
14. f(x) = 3x + 4
15. f(x) = 7 - 3x
Sample answer:
Sample answer:
x 2x - 3 f(x)
x 3x + 4 f(x)
x 7 - 3x f(x)
-2 2(-2) - 3 -7 2 2(2) - 3 1 5 2(5) - 3 7 8 2(8) - 3 13
Domain: {-2, 2, 5, 8} Range: {-7, 1, 7, 13}
-4 3(-4) + 4 -8 -2 3(-2) + 4 -2 1 3(1) + 4 7 3 3(3) + 4 13 Domain: {-4, -2, 1, 3} Range: {-8, -2, 7, 13}
-3 7 - 3(-3) 16 -1 7 - 3(-1) 10 3 7 - 3(3) -2 5 7 - 3(5) -8 Domain: {-3, -1, 3, 5} Range: {16, 10, -2, -8}
16. f(x) = 4x + 5
Sample answer:
17. f(x) = 1 - 4x
Sample answer:
18. f(x) = 6x - 2
Sample answer:
x 4x + 5 f(x)
x 1 - 4x f(x)
x 6x - 2 f(x)
-4 4(-4) + 5 -11
-2 1 - 4(-2) 9
-5 6(-5) - 2 -32
-1 4(-1) + 5 1
0 1 - 4(0) 1
-3 6(-3) - 2 -20
2 4(2) + 5 13
3 1 - 4(3) -11
2 6(2) - 2 10
6 4(6) + 5 29 Domain: {-4, -1, 2, 6} Range: {-11, 1, 13, 29}
5 1 - 4(5) -19 Domain: {-2, 0, 3, 5} Range: {9, 1, -11, -19}
7 6(7) - 2 40 Domain: {-5, -3, 2, 7} Range: {-32, -20, 10, 40}
58
Course 3 ? Chapter 4 Functions
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