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Find [tex]$f \circ g, g \circ f$[/tex], and [tex][tex]$g \circ g$[/tex][/tex].

Given:
[tex]f(x)=x+4[/tex]
[tex]g(x)=x-5[/tex]

(a) [tex]f \circ g[/tex]
[tex]\(\square\)[/tex]

(b) [tex]g \circ f[/tex]
[tex]\(\square\)[/tex]

(c) [tex]g \circ g[/tex]
[tex]\(\square\)[/tex]


Sagot :

To find the compositions of the functions [tex]\( f \)[/tex] and [tex]\( g \)[/tex], we will work through each part step-by-step.

Given:
[tex]\[ f(x) = x + 4 \][/tex]
[tex]\[ g(x) = x - 5 \][/tex]

### (a) [tex]\( f \circ g \)[/tex]

To find [tex]\( f \circ g \)[/tex], we need to compute [tex]\( f(g(x)) \)[/tex].

1. Start with the inside function [tex]\( g(x) \)[/tex]:
[tex]\[ g(x) = x - 5 \][/tex]

2. Now substitute [tex]\( g(x) \)[/tex] into [tex]\( f \)[/tex]:
[tex]\[ f(g(x)) = f(x - 5) \][/tex]

3. Apply [tex]\( f(x) \)[/tex] to [tex]\( x - 5 \)[/tex]:
[tex]\[ f(x - 5) = (x - 5) + 4 \][/tex]

4. Simplify the expression:
[tex]\[ f(x - 5) = x - 1 \][/tex]

Thus, [tex]\( f \circ g = f(g(x)) = x - 1 \)[/tex].

### (b) [tex]\( g \circ f \)[/tex]

To find [tex]\( g \circ f \)[/tex], we need to compute [tex]\( g(f(x)) \)[/tex].

1. Start with the inside function [tex]\( f(x) \)[/tex]:
[tex]\[ f(x) = x + 4 \][/tex]

2. Now substitute [tex]\( f(x) \)[/tex] into [tex]\( g \)[/tex]:
[tex]\[ g(f(x)) = g(x + 4) \][/tex]

3. Apply [tex]\( g(x) \)[/tex] to [tex]\( x + 4 \)[/tex]:
[tex]\[ g(x + 4) = (x + 4) - 5 \][/tex]

4. Simplify the expression:
[tex]\[ g(x + 4) = x - 1 \][/tex]

Thus, [tex]\( g \circ f = g(f(x)) = x - 1 \)[/tex].

### (c) [tex]\( g \circ g \)[/tex]

To find [tex]\( g \circ g \)[/tex], we need to compute [tex]\( g(g(x)) \)[/tex].

1. Start with the inside function [tex]\( g(x) \)[/tex]:
[tex]\[ g(x) = x - 5 \][/tex]

2. Now substitute [tex]\( g(x) \)[/tex] into another [tex]\( g \)[/tex]:
[tex]\[ g(g(x)) = g(x - 5) \][/tex]

3. Apply [tex]\( g(x) \)[/tex] to [tex]\( x - 5 \)[/tex]:
[tex]\[ g(x - 5) = (x - 5) - 5 \][/tex]

4. Simplify the expression:
[tex]\[ g(x - 5) = x - 10 \][/tex]

Thus, [tex]\( g \circ g = g(g(x)) = x - 10 \)[/tex].

So the final results are:
(a) [tex]\( f \circ g = x - 1 \)[/tex]
(b) [tex]\( g \circ f = x - 1 \)[/tex]
(c) [tex]\( g \circ g = x - 10 \)[/tex]