Solve the rational inequality and graph the solution set on a real number line. x +1 <2 x +5

Algebra and Trigonometry (6th Edition)
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Author:Robert F. Blitzer
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ChapterP: Prerequisites: Fundamental Concepts Of Algebra
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Problem 1MCCP: In Exercises 1-25, simplify the given expression or perform the indicated operation (and simplify,...
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### Solving Rational Inequalities and Graphing the Solution Set

#### Problem Statement:
Solve the following rational inequality and graph the solution set on a real number line:

\[ \frac{x + 1}{x + 5} < 2 \]

#### Solution Steps:

1. **Rewrite the Inequality**:
   First, rewrite the inequality in a standard form by bringing all terms to one side.
   \[ \frac{x + 1}{x + 5} - 2 < 0 \]

2. **Combine the Terms**:
   Combine the terms into a single fraction.
   \[ \frac{x + 1 - 2(x + 5)}{x + 5} < 0 \]
   Simplify the numerator:
   \[ \frac{x + 1 - 2x - 10}{x + 5} < 0 \]
   \[ \frac{-x - 9}{x + 5} < 0 \]

3. **Determine Critical Points**:
   Find the values that make the numerator and denominator zero.
   - Numerator: \(-x - 9 = 0\) ⟹ \( x = -9 \)
   - Denominator: \(x + 5 = 0\) ⟹ \( x = -5 \)

4. **Test Intervals**:
   The critical points divide the number line into intervals. Test each interval to determine where the inequality holds true:
   - Interval 1: \( (-\infty, -9) \)
   - Interval 2: \( (-9, -5) \)
   - Interval 3: \( (-5, \infty) \)

   Select test points for each interval:
   - For \( (-\infty, -9) \), test \( x = -10 \)
   - For \( (-9, -5) \), test \( x = -7 \)
   - For \( (-5, \infty) \), test \( x = 0 \)

   Evaluate the inequality \( \frac{-x - 9}{x + 5} < 0 \) for each test point.

5. **Graph the Solution**:
   Graph the solution set on a real number line, marking the intervals where the inequality is satisfied. Note that the critical points \( x=-9 \) and \( x=-5 \) will not
Transcribed Image Text:### Solving Rational Inequalities and Graphing the Solution Set #### Problem Statement: Solve the following rational inequality and graph the solution set on a real number line: \[ \frac{x + 1}{x + 5} < 2 \] #### Solution Steps: 1. **Rewrite the Inequality**: First, rewrite the inequality in a standard form by bringing all terms to one side. \[ \frac{x + 1}{x + 5} - 2 < 0 \] 2. **Combine the Terms**: Combine the terms into a single fraction. \[ \frac{x + 1 - 2(x + 5)}{x + 5} < 0 \] Simplify the numerator: \[ \frac{x + 1 - 2x - 10}{x + 5} < 0 \] \[ \frac{-x - 9}{x + 5} < 0 \] 3. **Determine Critical Points**: Find the values that make the numerator and denominator zero. - Numerator: \(-x - 9 = 0\) ⟹ \( x = -9 \) - Denominator: \(x + 5 = 0\) ⟹ \( x = -5 \) 4. **Test Intervals**: The critical points divide the number line into intervals. Test each interval to determine where the inequality holds true: - Interval 1: \( (-\infty, -9) \) - Interval 2: \( (-9, -5) \) - Interval 3: \( (-5, \infty) \) Select test points for each interval: - For \( (-\infty, -9) \), test \( x = -10 \) - For \( (-9, -5) \), test \( x = -7 \) - For \( (-5, \infty) \), test \( x = 0 \) Evaluate the inequality \( \frac{-x - 9}{x + 5} < 0 \) for each test point. 5. **Graph the Solution**: Graph the solution set on a real number line, marking the intervals where the inequality is satisfied. Note that the critical points \( x=-9 \) and \( x=-5 \) will not
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