Math Problem Statement

it is rational inequality

Solution

Thank you for clarifying that it's a rational inequality. Let's approach it with the appropriate method for solving rational inequalities. The inequality given is:

3x2<12\frac{3}{x-2} < \frac{1}{2}

Steps to solve the rational inequality:

  1. Move all terms to one side to have zero on the other side: 3x212<0\frac{3}{x-2} - \frac{1}{2} < 0

  2. Find a common denominator to combine the fractions: The common denominator for the fractions 3x2\frac{3}{x-2} and 12\frac{1}{2} is 2(x2)2(x-2). 6(x2)2(x2)<0\frac{6 - (x-2)}{2(x-2)} < 0

  3. Simplify the numerator: 6x+22(x2)<0\frac{6 - x + 2}{2(x-2)} < 0 8x2(x2)<0\frac{8 - x}{2(x-2)} < 0

  4. Identify the critical points by setting the numerator and denominator equal to zero**:

    • 8x=08 - x = 0 gives x=8x = 8.
    • x2=0x - 2 = 0 gives x=2x = 2.

    These are the points where the expression can change sign.

  5. Test the intervals determined by the critical points x=2x = 2 and x=8x = 8:

    • For x<2x < 2, say x=0x = 0: 802(02)=84=2\frac{8 - 0}{2(0-2)} = \frac{8}{-4} = -2 (negative).
    • For 2<x<82 < x < 8, say x=4x = 4: 842(42)=44=1\frac{8 - 4}{2(4-2)} = \frac{4}{4} = 1 (positive).
    • For x>8x > 8, say x=10x = 10: 8102(102)=216=18\frac{8 - 10}{2(10-2)} = \frac{-2}{16} = -\frac{1}{8} (negative).
  6. Determine the solution intervals:

    • The inequality 8x2(x2)<0\frac{8-x}{2(x-2)} < 0 is negative in the intervals (,2)(-\infty, 2) and (8,)(8, \infty).

    However, since x=2x = 2 makes the denominator zero (undefined), and x=8x = 8 makes the numerator zero (where the expression equals zero, not negative), we exclude these points from the solution.

Final Solution:

The solution to the inequality is: x(,2)(8,)x \in (-\infty, 2) \cup (8, \infty)

Let me know if you'd like any more details or if you have questions!

Here are five related questions to consider:

  1. How do you solve rational inequalities that have more than two factors in the denominator?
  2. What is the difference between solving a rational inequality and a polynomial inequality?
  3. Can you explain how to graph the solution set of a rational inequality?
  4. How do you determine the intervals of test points for more complex rational inequalities?
  5. What happens when the inequality involves a non-strict inequality, like \geq or \leq?

Tip: Always be cautious about points where the denominator is zero, as these points are not included in the solution set.

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Math Problem Analysis

Mathematical Concepts

Inequalities
Rational Functions

Formulas

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Theorems

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Suitable Grade Level

Grades 10-12