Find f+ g, f - g, fg, and f/g and their domains. f(x) = x2 + x, g(x) = x2 %3D

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Chapter3: Functions
Section3.4: Operations On Functions
Problem 123E
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Can someone explain in detail how these operations go? I am a bit confused by the placement of X because of the variable being X 

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The task is to find \( f + g \), \( f - g \), \( fg \), and \( \frac{f}{g} \) and their domains.

Given functions:
\[ f(x) = x^2 + x \]
\[ g(x) = x^2 \]

1. **Addition of functions (\( f + g \)):**
   \[ (f + g)(x) = f(x) + g(x) = x^2 + x + x^2 = 2x^2 + x \]

2. **Subtraction of functions (\( f - g \)):**
   \[ (f - g)(x) = f(x) - g(x) = x^2 + x - x^2 = x \]

3. **Multiplication of functions (\( fg \)):**
   \[ (fg)(x) = f(x) \cdot g(x) = (x^2 + x) \cdot x^2 = x^4 + x^3 \]

4. **Division of functions (\( \frac{f}{g} \)):**
   \[ \left( \frac{f}{g} \right)(x) = \frac{f(x)}{g(x)} = \frac{x^2 + x}{x^2} = 1 + \frac{1}{x} \]
   The domain for \(\frac{f}{g}\) excludes \(x = 0\) since division by zero is undefined.

**Domains:**
- The domains of \( f \), \( g \), \( f+g \), \( f-g \), and \( fg \) are all real numbers (\(\mathbb{R}\)).
- The domain of \(\frac{f}{g}\) is all real numbers except \(x = 0\).
Transcribed Image Text:The task is to find \( f + g \), \( f - g \), \( fg \), and \( \frac{f}{g} \) and their domains. Given functions: \[ f(x) = x^2 + x \] \[ g(x) = x^2 \] 1. **Addition of functions (\( f + g \)):** \[ (f + g)(x) = f(x) + g(x) = x^2 + x + x^2 = 2x^2 + x \] 2. **Subtraction of functions (\( f - g \)):** \[ (f - g)(x) = f(x) - g(x) = x^2 + x - x^2 = x \] 3. **Multiplication of functions (\( fg \)):** \[ (fg)(x) = f(x) \cdot g(x) = (x^2 + x) \cdot x^2 = x^4 + x^3 \] 4. **Division of functions (\( \frac{f}{g} \)):** \[ \left( \frac{f}{g} \right)(x) = \frac{f(x)}{g(x)} = \frac{x^2 + x}{x^2} = 1 + \frac{1}{x} \] The domain for \(\frac{f}{g}\) excludes \(x = 0\) since division by zero is undefined. **Domains:** - The domains of \( f \), \( g \), \( f+g \), \( f-g \), and \( fg \) are all real numbers (\(\mathbb{R}\)). - The domain of \(\frac{f}{g}\) is all real numbers except \(x = 0\).
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