Answers for Chapter Test – Chapter 7

1.	-0.3	2.	3|x |y2	3.		
4.	(x - 2)2	5.	7x2	6.	6x3y4	
7.		8.		9.	24	
10.	12—	11.	- 17 - 4	12.	36 + 38	
13.	— 1 —  	14.	3 +++	
15.		16.		17.		
18.	7	19.	2	20.	-43	
21.	8	
22.	x 2 - 4x + 4; domain: all reals	
23.	-2x2 + 7x - 6; domain: all reals	
24.	x - 1, domain {x | x   2}	
25.	-x3 + 5x2 - 8x + 4, domain: all reals	
26.	16x2 + 8x - 1, 4x2 - 7	
27.	18x2 + 9x - 6, -6x2 - 3x + 20	
28.	The sixth power of a real number is always nonnegative.	
29.	a. f(x) = 0.5x	
	b. g(x) = 0.75x	
	c.  g(g(x)) = 0.5625x	
	d. The cashier’s solution is too high by 6.25% of the original	
30.	price. 
y = 4- 1; y = 4 translated 5 units left and 1	
	unit down	
31.	y = 3y = 3 translated  unit left	

Answers for Chapter Test (cont.)

32.
33.
D: {x|x  -}, R: {y|y  0}
D: {x|x  0}, R: {y|y  3}
34.
35.
D: {x|x  -},   R: {y|y  -4}
D: {x|x 4}, R: {y|y  0}
36.   -5831	37.   192	38.   -63
39.	f -1(x) = yes
40.	g -1(x) = (x + 1)2 - 3, x  -1; yes
41.	g -1(x) =, x  0; yes
42.	f -1(x) = 4 x  0; no
43.	a. V =268.08
b.	r 
c.	r 2.88 in.
44.	Check students’ work.
45. 0.6 seconds;  0.9 seconds