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Algebra and Trigonometry (6th Edition)
6th Edition
ISBN:9780134463216
Author:Robert F. Blitzer
Publisher:Robert F. Blitzer
ChapterP: Prerequisites: Fundamental Concepts Of Algebra
Section: Chapter Questions
Problem 1MCCP: In Exercises 1-25, simplify the given expression or perform the indicated operation (and simplify,...
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### Educational Website: Mathematics Section

#### Example Problem: Subtracting Fractions

**Problem Statement:**
Subtract the fractions and show all work:

\[ \frac{1}{2} - \frac{3}{4} = \]

**Solution Steps:**

1. **Identify the Lowest Common Denominator (LCD):**
   - First, list the multiples of each denominator to find the LCD.
   
     Multiples of 2: \( 2, 4, 6, 8, 10, 12, 16 \) 
     
     Multiples of 4: \( 4, 8, 12, 16 \)

   - The smallest common multiple between the denominators 2 and 4 is 4. Therefore, 4 is the LCD.

2. **Adjust Fractions to Have the Same Denominator:**
   - Convert \(\frac{1}{2}\) to a fraction with denominator 4:
     \[ \frac{1}{2} = \frac{2}{4} \]

   - \(\frac{3}{4}\) already has the denominator 4, so it remains the same:
     \[ \frac{3}{4} \]

3. **Subtract the Fractions:**
   - Now perform the subtraction with like denominators:
     \[ \frac{2}{4} - \frac{3}{4} = \frac{2 - 3}{4} = \frac{-1}{4} \]

     Thus, the result is:
     \[ \frac{1}{2} - \frac{3}{4} = -\frac{1}{4} \]

#### Work Shown:

- Multiples of 2: `2, 4, 6, 8, 10, 12, 16`
- Multiples of 4: `4, 8, 12, 16`
- Calculation: \(\frac{2}{4} - \frac{3}{4} = \frac{-1}{4} \)

This detailed breakdown illustrates the process of subtracting fractions by finding a common denominator, converting both fractions, and then performing the subtraction operation.
Transcribed Image Text:### Educational Website: Mathematics Section #### Example Problem: Subtracting Fractions **Problem Statement:** Subtract the fractions and show all work: \[ \frac{1}{2} - \frac{3}{4} = \] **Solution Steps:** 1. **Identify the Lowest Common Denominator (LCD):** - First, list the multiples of each denominator to find the LCD. Multiples of 2: \( 2, 4, 6, 8, 10, 12, 16 \) Multiples of 4: \( 4, 8, 12, 16 \) - The smallest common multiple between the denominators 2 and 4 is 4. Therefore, 4 is the LCD. 2. **Adjust Fractions to Have the Same Denominator:** - Convert \(\frac{1}{2}\) to a fraction with denominator 4: \[ \frac{1}{2} = \frac{2}{4} \] - \(\frac{3}{4}\) already has the denominator 4, so it remains the same: \[ \frac{3}{4} \] 3. **Subtract the Fractions:** - Now perform the subtraction with like denominators: \[ \frac{2}{4} - \frac{3}{4} = \frac{2 - 3}{4} = \frac{-1}{4} \] Thus, the result is: \[ \frac{1}{2} - \frac{3}{4} = -\frac{1}{4} \] #### Work Shown: - Multiples of 2: `2, 4, 6, 8, 10, 12, 16` - Multiples of 4: `4, 8, 12, 16` - Calculation: \(\frac{2}{4} - \frac{3}{4} = \frac{-1}{4} \) This detailed breakdown illustrates the process of subtracting fractions by finding a common denominator, converting both fractions, and then performing the subtraction operation.
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