Math Problem Statement

Solve the inequality. (Enter your answer using interval notation.) |5x − 1| < 7

Solution

We are given the inequality:

5x1<7|5x - 1| < 7

To solve this, we must consider the definition of absolute value. The inequality A<B|A| < B (where AA is an expression and BB is a positive number) is equivalent to the double inequality:

B<A<B-B < A < B

Step 1: Rewrite the inequality without the absolute value

The inequality 5x1<7|5x - 1| < 7 becomes:

7<5x1<7-7 < 5x - 1 < 7

Step 2: Solve for xx

First, isolate 5x5x by adding 1 to all parts of the inequality:

7+1<5x<7+1-7 + 1 < 5x < 7 + 1

6<5x<8-6 < 5x < 8

Now, divide the entire inequality by 5 to isolate xx:

65<x<85\frac{-6}{5} < x < \frac{8}{5}

This simplifies to:

65<x<85-\frac{6}{5} < x < \frac{8}{5}

Step 3: Write the solution in interval notation

The solution is the set of xx-values between 65-\frac{6}{5} and 85\frac{8}{5}, not including the endpoints. So, the solution in interval notation is:

(65,85)\left( -\frac{6}{5}, \frac{8}{5} \right)

Let me know if you'd like further details or explanations!


Here are 5 related questions for you to consider:

  1. How do you solve inequalities involving \geq or \leq?
  2. How does the solution change if the inequality is 5x17|5x - 1| \leq 7?
  3. How would you solve 5x1>7|5x - 1| > 7?
  4. What is the general method for solving inequalities with absolute values?
  5. How do you graph the solution of 5x1<7|5x - 1| < 7 on a number line?

Tip: Always check your solution by plugging in values from within and outside your interval to verify if the inequality holds true.

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Math Problem Analysis

Mathematical Concepts

Algebra
Absolute Value Inequalities
Linear Inequalities

Formulas

|A| < B → -B < A < B
Linear inequality solving methods

Theorems

Absolute value property for inequalities

Suitable Grade Level

Grades 8-10