Solutions manual for algebra and trigonometry 6th edition by blitzer ibsn 9780134765501

Page 195

Chapter 2 Functions and Graphs

10.

14.

x x −3≤ +2 2 4 x x  4 −3 ≤ 4 +2 2 4 2 x −12 ≤ x + 8

Cumulative Review

x ≤ 20 The solution set is (−∞, 20].

domain of f: [3, ∞ )

11.

range of f: domain of

[ 2, ∞ ) f : [ 2, ∞ ) −1

range of f −1 : [3, ∞ )

15.

( 4 − ( x + h) ) − ( 4 − x ) =

( −∞, ∞ ) ( −∞, ∞ )

2

domain: range:

f ( x + h) − f ( x) h

=

(

)

h 4 − x 2 − 2xh − h 2 − 4 + x 2 = h −2 xh − h 2 = h h ( −2 x − h ) = h = −2x − h

domain: [ 0, 4 ]

[ −3,1]

h 4 − ( x + 2 xh + h 2 ) − 4 − x 2 2

12.

range:

2

16.

13.

( f g)(x) = f ( g ( x) ) ( f g)(x) = f ( x + 5)

0 = 4 − ( x + 5)

2

0 = 4 − ( x 2 + 10 x + 25) 0 = 4 − x 2 − 10 x − 25 0 = − x 2 −10 x − 21 0 = x 2 + 10 x + 21

( −∞, ∞ ) range of f: ( −∞, ∞ ) domain of g: ( −∞, ∞ ) range of g: ( −∞, ∞ )

0 = (x + 7)(x + 3) The value of ( f g)(x) will be 0 when x = −3 or x = −7.

domain of f:

17.

1 1 y = − x + , so m = 4. 4 3 point-slope form: y – 5 = 4(x + 2) slope-intercept form: y = 4x + 13 general form: 4 x − y + 13 = 0


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