Exercise 1.3.55 (55-56)

Use the table to evaluate each expression.

x 1 2 3 4 5 6
f ( x ) 3 1 5 6 2 4
g ( x ) 5 3 4 1 3 2
55.
(a)
f ( g ( 3 ) )
(b)
g ( f ( 2 ) )
(c)
( f g ) ( 5 )
(d)
( g f ) ( 5 ) .
56.
(a)
g ( g ( g ( 2 ) ) )
(b)
f ( f ( f ( 1 ) ) )
(c)
( f f g ) ( 1 )
(d)
( g f g ) ( 3 ) .

Answers

55.
(a)
f ( g ( 3 ) ) = f ( 4 ) = 6 .

(b)
g ( f ( 2 ) ) = g ( 1 ) = 5 .

(c)
( f g ) ( 5 ) = f ( g ( 5 ) ) = f ( 3 ) = 5 .

(d)
( g f ) ( 5 ) = g ( f ( 5 ) ) = g ( 2 ) = 3 .

56.
(a)
g ( g ( g ( 2 ) ) ) = g ( g ( 3 ) ) = g ( 4 ) = 1 .

(b)
( f f f ) ( 1 ) = f ( f ( f ( 1 ) ) ) = f ( f ( 3 ) ) = f ( 5 ) = 2 .

(c)
( f f g ) ( 1 ) = f ( f ( g ( 1 ) ) ) = f ( f ( 5 ) ) = f ( 2 ) = 1 .

(d)
( g f g ) ( 3 ) = g ( f ( g ( 3 ) ) ) = g ( f ( 4 ) ) = g ( 6 ) = 2 .

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2023-08-24 17:08
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