The problem asks us to solve the inequality $|\frac{x-2}{x+3}| < 4$.

AlgebraInequalitiesAbsolute ValueRational ExpressionsInterval Notation
2025/5/11

1. Problem Description

The problem asks us to solve the inequality x2x+3<4|\frac{x-2}{x+3}| < 4.

2. Solution Steps

We can rewrite the inequality as:
4<x2x+3<4-4 < \frac{x-2}{x+3} < 4
This can be split into two inequalities:
x2x+3<4\frac{x-2}{x+3} < 4 and x2x+3>4\frac{x-2}{x+3} > -4
Let's solve the first inequality: x2x+3<4\frac{x-2}{x+3} < 4.
Subtract 4 from both sides: x2x+34<0\frac{x-2}{x+3} - 4 < 0.
Combine the terms on the left: x24(x+3)x+3<0\frac{x-2 - 4(x+3)}{x+3} < 0.
Simplify the numerator: x24x12x+3<0\frac{x-2 - 4x - 12}{x+3} < 0, which gives 3x14x+3<0\frac{-3x - 14}{x+3} < 0.
Multiply both sides by 1-1 and reverse the inequality sign: 3x+14x+3>0\frac{3x + 14}{x+3} > 0.
Now we analyze the sign of the expression. The critical points are x=3x = -3 and x=143x = -\frac{14}{3}.
We consider three intervals:
- x<143x < -\frac{14}{3}: Both 3x+143x + 14 and x+3x+3 are negative, so the fraction is positive.
- 143<x<3-\frac{14}{3} < x < -3: 3x+143x + 14 is positive and x+3x+3 is negative, so the fraction is negative.
- x>3x > -3: Both 3x+143x + 14 and x+3x+3 are positive, so the fraction is positive.
Therefore, the solution to the first inequality is x<143x < -\frac{14}{3} or x>3x > -3.
Now let's solve the second inequality: x2x+3>4\frac{x-2}{x+3} > -4.
Add 4 to both sides: x2x+3+4>0\frac{x-2}{x+3} + 4 > 0.
Combine the terms on the left: x2+4(x+3)x+3>0\frac{x-2 + 4(x+3)}{x+3} > 0.
Simplify the numerator: x2+4x+12x+3>0\frac{x-2 + 4x + 12}{x+3} > 0, which gives 5x+10x+3>0\frac{5x + 10}{x+3} > 0.
Simplify: 5(x+2)x+3>0\frac{5(x+2)}{x+3} > 0, so x+2x+3>0\frac{x+2}{x+3} > 0.
The critical points are x=2x = -2 and x=3x = -3.
We consider three intervals:
- x<3x < -3: Both x+2x+2 and x+3x+3 are negative, so the fraction is positive.
- 3<x<2-3 < x < -2: x+2x+2 is negative and x+3x+3 is positive, so the fraction is negative.
- x>2x > -2: Both x+2x+2 and x+3x+3 are positive, so the fraction is positive.
Therefore, the solution to the second inequality is x<3x < -3 or x>2x > -2.
Now we need to find the intersection of the two solutions.
The first solution is x<143x < -\frac{14}{3} or x>3x > -3, and the second solution is x<3x < -3 or x>2x > -2.
Since 1434.67-\frac{14}{3} \approx -4.67, the intersection is x<143x < -\frac{14}{3} or x>2x > -2.
In interval notation, this is (,143)(2,)(-\infty, -\frac{14}{3}) \cup (-2, \infty).

3. Final Answer

(,143)(2,)(-\infty, -\frac{14}{3}) \cup (-2, \infty)