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Chapter 2 Functions and Their Graphs Section 2.1
11. True
( −1,3)
12. True
1.
2. 3 ( −2 )
2
13. False; if the domain is not specified, we assume it is the largest set of real numbers for which the value of f is a real number.
1 1 − 5 ( −2 ) + = 3 ( 4 ) − 5 ( −2 ) − 2 ( −2 ) = 12 + 10 − =
1 2
14. False; the domain of f ( x ) =
43 or 21 12 or 21.5 2
x2 − 4 is { x | x ≠ 0} . x
15. Function Domain: {Elvis, Colleen, Kaleigh, Marissa} Range: {Jan. 8, Mar. 15, Sept. 17}
3. We must not allow the denominator to be 0. x + 4 ≠ 0 x ≠ −4 ; Domain: { x x ≠ −4} .
16. Not a function
4. 3 − 2 x > 5
17. Not a function
−2 x > 2 x < −1 Solution set: { x | x < −1} or ( −∞, −1)
5. independent; dependent
18. Function Domain: {Less than 9th grade, 9th-12th grade, High School Graduate, Some College, College Graduate} Range: {$18,120, $23,251, $36,055, $45,810, $67,165}
6. range
19. Not a function
−1
7.
0
20. Function Domain: {–2, –1, 3, 4} Range: {3, 5, 7, 12}
[ 0,5]
We need the intersection of the intervals [ 0, 7 ]
and [ −2,5] . That is, domain of f ∩ domain of g .
21. Function Domain: {1, 2, 3, 4} Range: {3}
f
−2
0
5
7
−2
0
5
7
−2
0
5
7
g
22. Function Domain: {0, 1, 2, 3} Range: {–2, 3, 7}
f+g
23. Not a function
8. ≠ ; f; g 9.
( g − f )( x )
24. Not a function
or g ( x ) − f ( x )
25. Function Domain: {–2, –1, 0, 1} Range: {0, 1, 4}
10. False; every function is a relation, but not every relation is a function. For example, the relation x 2 + y 2 = 1 is not a function.
26. Function Domain: {–2, –1, 0, 1} Range: {3, 4, 16} 66
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