We are asked to solve the inequality $|\frac{3x}{2x+3}| < 2$.

AlgebraInequalitiesAbsolute ValueRational FunctionsInterval Notation
2025/5/26

1. Problem Description

We are asked to solve the inequality 3x2x+3<2|\frac{3x}{2x+3}| < 2.

2. Solution Steps

We need to solve the inequality 3x2x+3<2|\frac{3x}{2x+3}| < 2.
This is equivalent to 2<3x2x+3<2-2 < \frac{3x}{2x+3} < 2.
We have two inequalities to solve:

1. $\frac{3x}{2x+3} < 2$

2. $\frac{3x}{2x+3} > -2$

Let's solve the first inequality:
3x2x+3<2\frac{3x}{2x+3} < 2
3x2x+32<0\frac{3x}{2x+3} - 2 < 0
3x2(2x+3)2x+3<0\frac{3x - 2(2x+3)}{2x+3} < 0
3x4x62x+3<0\frac{3x - 4x - 6}{2x+3} < 0
x62x+3<0\frac{-x-6}{2x+3} < 0
x+62x+3>0\frac{x+6}{2x+3} > 0
The critical points are x=6x = -6 and x=32x = -\frac{3}{2}.
We consider the intervals (,6)(-\infty, -6), (6,32)(-6, -\frac{3}{2}) and (32,)(-\frac{3}{2}, \infty).
If x<6x<-6, say x=7x=-7, 7+62(7)+3=111=111>0\frac{-7+6}{2(-7)+3} = \frac{-1}{-11} = \frac{1}{11} > 0.
If 6<x<32-6 < x < -\frac{3}{2}, say x=2x = -2, 2+62(2)+3=41=4<0\frac{-2+6}{2(-2)+3} = \frac{4}{-1} = -4 < 0.
If x>32x > -\frac{3}{2}, say x=0x=0, 0+62(0)+3=63=2>0\frac{0+6}{2(0)+3} = \frac{6}{3} = 2 > 0.
So the solution to the first inequality is x<6x < -6 or x>32x > -\frac{3}{2}.
Now let's solve the second inequality:
3x2x+3>2\frac{3x}{2x+3} > -2
3x2x+3+2>0\frac{3x}{2x+3} + 2 > 0
3x+2(2x+3)2x+3>0\frac{3x + 2(2x+3)}{2x+3} > 0
3x+4x+62x+3>0\frac{3x + 4x + 6}{2x+3} > 0
7x+62x+3>0\frac{7x+6}{2x+3} > 0
The critical points are x=67x = -\frac{6}{7} and x=32x = -\frac{3}{2}.
We consider the intervals (,32)(-\infty, -\frac{3}{2}), (32,67)(-\frac{3}{2}, -\frac{6}{7}) and (67,)(-\frac{6}{7}, \infty).
If x<32x < -\frac{3}{2}, say x=2x = -2, 7(2)+62(2)+3=81=8>0\frac{7(-2)+6}{2(-2)+3} = \frac{-8}{-1} = 8 > 0.
If 32<x<67-\frac{3}{2} < x < -\frac{6}{7}, say x=1x = -1, 7(1)+62(1)+3=11=1<0\frac{7(-1)+6}{2(-1)+3} = \frac{-1}{1} = -1 < 0.
If x>67x > -\frac{6}{7}, say x=0x = 0, 7(0)+62(0)+3=63=2>0\frac{7(0)+6}{2(0)+3} = \frac{6}{3} = 2 > 0.
So the solution to the second inequality is x<32x < -\frac{3}{2} or x>67x > -\frac{6}{7}.
Now we need to find the intersection of the two solutions:
x<6x < -6 or x>32x > -\frac{3}{2} and x<32x < -\frac{3}{2} or x>67x > -\frac{6}{7}.
This means x<6x < -6 or x>67x > -\frac{6}{7}.

3. Final Answer

x<6x < -6 or x>67x > -\frac{6}{7}

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