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Sagot :
Alright, let's tackle each part step-by-step.
### Part (a): Finding the Domains
1. Domain of [tex]\( f(x) = x - 8 \)[/tex]:
The function [tex]\( f \)[/tex] is a linear function defined for all real numbers. Thus, the domain of [tex]\( f \)[/tex] is:
[tex]\[ \text{Domain of } f: \mathbb{R} \][/tex]
2. Domain of [tex]\( g(x) = \sqrt{x + 4} \)[/tex]:
The square root function is defined where its argument is non-negative, meaning:
[tex]\[ x + 4 \geq 0 \implies x \geq -4 \][/tex]
Thus, the domain of [tex]\( g \)[/tex] is:
[tex]\[ \text{Domain of } g: [-4, \infty) \][/tex]
3. Domain of [tex]\( (f+g)(x) = f(x) + g(x) \)[/tex]:
The domain of [tex]\( f+g \)[/tex] is the intersection of the domains of [tex]\( f \)[/tex] and [tex]\( g \)[/tex]:
[tex]\[ \text{Domain of } (f+g): [-4, \infty) \][/tex]
4. Domain of [tex]\( (f-g)(x) = f(x) - g(x) \)[/tex]:
The domain of [tex]\( f-g \)[/tex] is also the intersection of the domains of [tex]\( f \)[/tex] and [tex]\( g \)[/tex]:
[tex]\[ \text{Domain of } (f-g): [-4, \infty) \][/tex]
5. Domain of [tex]\( (fg)(x) = f(x) \cdot g(x) \)[/tex]:
The domain of [tex]\( fg \)[/tex] is likewise the intersection of the domains of [tex]\( f \)[/tex] and [tex]\( g \)[/tex]:
[tex]\[ \text{Domain of } (fg): [-4, \infty) \][/tex]
6. Domain of [tex]\( (ff)(x) = f(x) \cdot f(x) \)[/tex]:
Since [tex]\( f \)[/tex] is defined for all real numbers:
[tex]\[ \text{Domain of } (ff): \mathbb{R} \][/tex]
7. Domain of [tex]\( \left(\frac{f}{g}\right)(x) = \frac{f(x)}{g(x)} \)[/tex]:
Here, we need [tex]\( g(x) \neq 0 \)[/tex] and [tex]\( g \)[/tex] itself must be defined. Thus, the domain is:
[tex]\[ g(x) \neq 0 \implies \sqrt{x+4} \neq 0 \implies x \neq -4 \][/tex]
Therefore, the domain is:
[tex]\[ \text{Domain of } \left(\frac{f}{g}\right): (-4, \infty) \setminus \{-4\} \][/tex]
Which can be written more compactly as:
[tex]\[ \text{Domain of } \left(\frac{f}{g}\right): (-4, \infty) \][/tex]
8. Domain of [tex]\( \left(\frac{g}{f}\right)(x) = \frac{g(x)}{f(x)} \)[/tex]:
Here, we need [tex]\( f(x) \neq 0 \)[/tex] and [tex]\( f \)[/tex] and [tex]\( g \)[/tex] must both be defined. Thus, the domain is:
[tex]\[ f(x) \neq 0 \implies x - 8 \neq 0 \implies x \neq 8 \][/tex]
So the intersection of the domains and the exclusion gives us:
[tex]\[ \text{Domain of } \left(\frac{g}{f}\right): [-4, 8) \cup (8, \infty) \][/tex]
### Part (b): Finding the Functions
1. [tex]\( (f+g)(x) \)[/tex]:
[tex]\[ (f+g)(x) = f(x) + g(x) = (x - 8) + \sqrt{x+4} = x + \sqrt{x+4} - 8 \][/tex]
2. [tex]\( (f-g)(x) \)[/tex]:
[tex]\[ (f-g)(x) = f(x) - g(x) = (x - 8) - \sqrt{x+4} = x - \sqrt{x+4} - 8 \][/tex]
3. [tex]\( (fg)(x) \)[/tex]:
[tex]\[ (fg)(x) = f(x) \cdot g(x) = (x - 8) \cdot \sqrt{x + 4} \][/tex]
4. [tex]\( (ff)(x) \)[/tex]:
[tex]\[ (ff)(x) = f(x) \cdot f(x) = (x - 8) \cdot (x - 8) = (x - 8)^2 \][/tex]
5. [tex]\( \left(\frac{f}{g}\right)(x) \)[/tex]:
[tex]\[ \left(\frac{f}{g}\right)(x) = \frac{f(x)}{g(x)} = \frac{x - 8}{\sqrt{x + 4}} \][/tex]
6. [tex]\( \left(\frac{g}{f}\right)(x) \)[/tex]:
[tex]\[ \left(\frac{g}{f}\right)(x) = \frac{g(x)}{f(x)} = \frac{\sqrt{x + 4}}{x - 8} \][/tex]
This covers both parts (a) and (b) in detail.
### Part (a): Finding the Domains
1. Domain of [tex]\( f(x) = x - 8 \)[/tex]:
The function [tex]\( f \)[/tex] is a linear function defined for all real numbers. Thus, the domain of [tex]\( f \)[/tex] is:
[tex]\[ \text{Domain of } f: \mathbb{R} \][/tex]
2. Domain of [tex]\( g(x) = \sqrt{x + 4} \)[/tex]:
The square root function is defined where its argument is non-negative, meaning:
[tex]\[ x + 4 \geq 0 \implies x \geq -4 \][/tex]
Thus, the domain of [tex]\( g \)[/tex] is:
[tex]\[ \text{Domain of } g: [-4, \infty) \][/tex]
3. Domain of [tex]\( (f+g)(x) = f(x) + g(x) \)[/tex]:
The domain of [tex]\( f+g \)[/tex] is the intersection of the domains of [tex]\( f \)[/tex] and [tex]\( g \)[/tex]:
[tex]\[ \text{Domain of } (f+g): [-4, \infty) \][/tex]
4. Domain of [tex]\( (f-g)(x) = f(x) - g(x) \)[/tex]:
The domain of [tex]\( f-g \)[/tex] is also the intersection of the domains of [tex]\( f \)[/tex] and [tex]\( g \)[/tex]:
[tex]\[ \text{Domain of } (f-g): [-4, \infty) \][/tex]
5. Domain of [tex]\( (fg)(x) = f(x) \cdot g(x) \)[/tex]:
The domain of [tex]\( fg \)[/tex] is likewise the intersection of the domains of [tex]\( f \)[/tex] and [tex]\( g \)[/tex]:
[tex]\[ \text{Domain of } (fg): [-4, \infty) \][/tex]
6. Domain of [tex]\( (ff)(x) = f(x) \cdot f(x) \)[/tex]:
Since [tex]\( f \)[/tex] is defined for all real numbers:
[tex]\[ \text{Domain of } (ff): \mathbb{R} \][/tex]
7. Domain of [tex]\( \left(\frac{f}{g}\right)(x) = \frac{f(x)}{g(x)} \)[/tex]:
Here, we need [tex]\( g(x) \neq 0 \)[/tex] and [tex]\( g \)[/tex] itself must be defined. Thus, the domain is:
[tex]\[ g(x) \neq 0 \implies \sqrt{x+4} \neq 0 \implies x \neq -4 \][/tex]
Therefore, the domain is:
[tex]\[ \text{Domain of } \left(\frac{f}{g}\right): (-4, \infty) \setminus \{-4\} \][/tex]
Which can be written more compactly as:
[tex]\[ \text{Domain of } \left(\frac{f}{g}\right): (-4, \infty) \][/tex]
8. Domain of [tex]\( \left(\frac{g}{f}\right)(x) = \frac{g(x)}{f(x)} \)[/tex]:
Here, we need [tex]\( f(x) \neq 0 \)[/tex] and [tex]\( f \)[/tex] and [tex]\( g \)[/tex] must both be defined. Thus, the domain is:
[tex]\[ f(x) \neq 0 \implies x - 8 \neq 0 \implies x \neq 8 \][/tex]
So the intersection of the domains and the exclusion gives us:
[tex]\[ \text{Domain of } \left(\frac{g}{f}\right): [-4, 8) \cup (8, \infty) \][/tex]
### Part (b): Finding the Functions
1. [tex]\( (f+g)(x) \)[/tex]:
[tex]\[ (f+g)(x) = f(x) + g(x) = (x - 8) + \sqrt{x+4} = x + \sqrt{x+4} - 8 \][/tex]
2. [tex]\( (f-g)(x) \)[/tex]:
[tex]\[ (f-g)(x) = f(x) - g(x) = (x - 8) - \sqrt{x+4} = x - \sqrt{x+4} - 8 \][/tex]
3. [tex]\( (fg)(x) \)[/tex]:
[tex]\[ (fg)(x) = f(x) \cdot g(x) = (x - 8) \cdot \sqrt{x + 4} \][/tex]
4. [tex]\( (ff)(x) \)[/tex]:
[tex]\[ (ff)(x) = f(x) \cdot f(x) = (x - 8) \cdot (x - 8) = (x - 8)^2 \][/tex]
5. [tex]\( \left(\frac{f}{g}\right)(x) \)[/tex]:
[tex]\[ \left(\frac{f}{g}\right)(x) = \frac{f(x)}{g(x)} = \frac{x - 8}{\sqrt{x + 4}} \][/tex]
6. [tex]\( \left(\frac{g}{f}\right)(x) \)[/tex]:
[tex]\[ \left(\frac{g}{f}\right)(x) = \frac{g(x)}{f(x)} = \frac{\sqrt{x + 4}}{x - 8} \][/tex]
This covers both parts (a) and (b) in detail.
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