We need to solve the following inequality: $\frac{2}{|x-3|-1} + \frac{3}{|x-3|+2} \leq 0$

AlgebraInequalitiesAbsolute ValueIntervalsSolving Inequalities
2025/5/25

1. Problem Description

We need to solve the following inequality:
2x31+3x3+20\frac{2}{|x-3|-1} + \frac{3}{|x-3|+2} \leq 0

2. Solution Steps

Let u=x3u = |x-3|. The inequality becomes:
2u1+3u+20\frac{2}{u-1} + \frac{3}{u+2} \leq 0
Combine the fractions:
2(u+2)+3(u1)(u1)(u+2)0\frac{2(u+2) + 3(u-1)}{(u-1)(u+2)} \leq 0
2u+4+3u3(u1)(u+2)0\frac{2u+4 + 3u-3}{(u-1)(u+2)} \leq 0
5u+1(u1)(u+2)0\frac{5u+1}{(u-1)(u+2)} \leq 0
The critical points are u=15u = -\frac{1}{5}, u=1u = 1, and u=2u = -2. Since u=x30u = |x-3| \geq 0, we can ignore u=2u=-2.
We consider the intervals (,15](-\infty, -\frac{1}{5}], [15,1][-\frac{1}{5}, 1], and [1,)[1, \infty). However, since u0u \geq 0, we only need to check the intervals [0,15][0, -\frac{1}{5}], [15,1][-\frac{1}{5}, 1] and [1,)[1, \infty).
The interval [0,15][0, -\frac{1}{5}] is an empty set.
So, we have intervals [0,1)[0, 1) and (1,)(1, \infty).
Check the sign of 5u+1(u1)(u+2)\frac{5u+1}{(u-1)(u+2)} on the intervals [0,1)[0, 1) and (1,)(1, \infty):
If 0u<10 \leq u < 1, let u=0u=0. Then 5(0)+1(01)(0+2)=1(1)(2)=120\frac{5(0)+1}{(0-1)(0+2)} = \frac{1}{(-1)(2)} = -\frac{1}{2} \leq 0. This is true. Also, we have 5u+105u+1 \geq 0 and since we want 5u+1(u1)(u+2)0\frac{5u+1}{(u-1)(u+2)} \leq 0, then (u1)(u+2)<0(u-1)(u+2) < 0.
Since u+2>0u+2>0, we need u1<0u-1<0 or u<1u<1. Since u0u \geq 0, 0u<10 \leq u < 1 is valid.
If u=1u=1, the expression is undefined.
If u>1u > 1, let u=2u=2. Then 5(2)+1(21)(2+2)=11(1)(4)=114>0\frac{5(2)+1}{(2-1)(2+2)} = \frac{11}{(1)(4)} = \frac{11}{4} > 0.
If u=15u = -\frac{1}{5}, 5u+1(u1)(u+2)=0\frac{5u+1}{(u-1)(u+2)} = 0.
So, we have 0u150 \leq u \leq -\frac{1}{5} or 0u<10 \leq u < 1. Since x30|x-3| \geq 0 for all real x.
0x3<10 \leq |x-3| < 1
1<x3<1-1 < x-3 < 1
2<x<42 < x < 4
x3=15|x-3| = -\frac{1}{5}
x3=15x-3 = \frac{1}{5} or x3=15x-3 = -\frac{1}{5}
x=165x = \frac{16}{5} or x=145x = \frac{14}{5}
2<x<42 < x < 4, x=165=3.2x= \frac{16}{5} = 3.2, x=145=2.8x= \frac{14}{5} = 2.8
Then 2<x145165<x<42 < x \leq \frac{14}{5} \cup \frac{16}{5} < x < 4 or (145x<4)(\frac{14}{5} \leq x < 4).
So the solution to the inequality is 2<x<42 < x < 4.
2<x<42 < x < 4 is valid because if x=3x=3, then 20+35\frac{2}{0} + \frac{3}{5} is undefined. Thus, we have x3x\neq 3.
Thus, 2<x<42 < x < 4.
0x3<10 \leq |x-3| < 1, so 1<x3<1-1 < x-3 < 1, and thus 2<x<42 < x < 4.
Or 5x3+1=05|x-3| + 1 = 0
x3=15|x-3| = -\frac{1}{5}, but absolute value cannot be negative.

3. Final Answer

2<x<42 < x < 4

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