Math Problem Statement

Solve the inequality |5 - 4x| > 8 and write the solution set in interval notation.

Solution

The given inequality is 54x>8|5 - 4x| > 8. Let's solve this step-by-step:

Step 1: Break the absolute value inequality

For an inequality of the form A>B|A| > B, where B>0B > 0, the solution is split into two cases:

  1. A>BA > B
  2. A<BA < -B

So, we break the inequality 54x>8|5 - 4x| > 8 into two cases:

  • 54x>85 - 4x > 8
  • 54x<85 - 4x < -8

Step 2: Solve each inequality

Case 1: 54x>85 - 4x > 8

Subtract 5 from both sides: 4x>3-4x > 3 Divide by 4-4 (and reverse the inequality sign): x<34x < -\frac{3}{4}

Case 2: 54x<85 - 4x < -8

Subtract 5 from both sides: 4x<13-4x < -13 Divide by 4-4 (and reverse the inequality sign): x>134x > \frac{13}{4}

Step 3: Combine the solutions

The combined solution from both cases is: x<34orx>134x < -\frac{3}{4} \quad \text{or} \quad x > \frac{13}{4}

In interval notation, this is: (,34)(134,)(-\infty, -\frac{3}{4}) \cup (\frac{13}{4}, \infty)

Step 4: Match with the options

From the provided options in the image, the correct one is: (,34)(134,)(-\infty, -\frac{3}{4}) \cup (\frac{13}{4}, \infty)

This corresponds to the second option in the list.

Would you like more details on any part of the solution? Here are five related questions to practice:

  1. How do you solve absolute value inequalities of the form A<B|A| < B?
  2. What happens if B=0B = 0 in an absolute value inequality A>B|A| > B?
  3. Can you graph the solution of 54x>8|5 - 4x| > 8 on a number line?
  4. How do you solve compound inequalities involving "and" or "or"?
  5. What is the general rule for reversing inequality signs when multiplying or dividing by a negative number?

Tip: Always remember to reverse the inequality sign when dividing or multiplying both sides of an inequality by a negative number.

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Math Problem Analysis

Mathematical Concepts

Algebra
Absolute Value Inequalities

Formulas

Absolute Value Inequality: |A| > B implies A > B or A < -B

Theorems

Properties of Inequalities
Interval Notation

Suitable Grade Level

College Level or Grades 11-12