Math Problem Statement

Solve the following inequality algebraically. 2, vertical bar, x, plus, 8, vertical bar, minus, 5, is greater than, 3 2∣x+8∣−5>3

Solution

To solve the inequality 2x+85>32|x + 8| - 5 > 3 algebraically, follow these steps:

Step 1: Isolate the absolute value expression

Start by isolating the absolute value expression on one side of the inequality.

2x+85>32|x + 8| - 5 > 3

Add 5 to both sides:

2x+8>82|x + 8| > 8

Next, divide both sides by 2:

x+8>4|x + 8| > 4

Step 2: Break the absolute value inequality into two cases

The inequality x+8>4|x + 8| > 4 means that the expression inside the absolute value can be either greater than 4 or less than -4. So, we split this into two cases:

  1. Case 1: x+8>4x + 8 > 4
  2. Case 2: x+8<4x + 8 < -4

Step 3: Solve each case

Case 1: x+8>4x + 8 > 4

Subtract 8 from both sides:

x>4x > -4

Case 2: x+8<4x + 8 < -4

Subtract 8 from both sides:

x<12x < -12

Step 4: Combine the solutions

The solutions from the two cases give us the solution set:

x>4orx<12x > -4 \quad \text{or} \quad x < -12

Step 5: Write the solution in interval notation

The solution set is the union of the two intervals:

x(,12)(4,)x \in (-\infty, -12) \cup (-4, \infty)

This is the algebraic solution to the inequality 2x+85>32|x + 8| - 5 > 3.

Would you like more details or have any questions?

Here are five related questions for practice:

  1. Solve the inequality 3x5+2>113|x - 5| + 2 > 11.
  2. Solve the equation 4x+1=124|x + 1| = 12.
  3. What is the solution to 2x37|2x - 3| \leq 7?
  4. Solve the compound inequality x+6<2|x + 6| < 2 and x+6>2|x + 6| > -2.
  5. Find the solution set for 3x+915|3x + 9| \geq 15.

Tip: When solving absolute value inequalities, always consider both the positive and negative scenarios for the expression inside the absolute value.

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Math Problem Analysis

Mathematical Concepts

Algebra
Inequalities
Absolute Value

Formulas

Absolute value inequality: |A| > B implies A > B or A < -B

Theorems

Properties of Absolute Value
Inequality Solving

Suitable Grade Level

Grades 9-11