We need to solve the following compound inequality: $\frac{7x}{2x+3} > -2$ and $\frac{3x}{2x+3} < 2$

AlgebraInequalitiesRational InequalitiesCompound InequalitiesInterval Notation
2025/5/25

1. Problem Description

We need to solve the following compound inequality:
7x2x+3>2\frac{7x}{2x+3} > -2 and 3x2x+3<2\frac{3x}{2x+3} < 2

2. Solution Steps

Let's solve the first inequality:
7x2x+3>2\frac{7x}{2x+3} > -2
7x2x+3+2>0\frac{7x}{2x+3} + 2 > 0
7x+2(2x+3)2x+3>0\frac{7x + 2(2x+3)}{2x+3} > 0
7x+4x+62x+3>0\frac{7x + 4x + 6}{2x+3} > 0
11x+62x+3>0\frac{11x + 6}{2x+3} > 0
The critical points are x=611x = -\frac{6}{11} and x=32x = -\frac{3}{2}. We need to consider three intervals: x<32x < -\frac{3}{2}, 32<x<611-\frac{3}{2} < x < -\frac{6}{11}, and x>611x > -\frac{6}{11}.
If x<32x < -\frac{3}{2}, both 11x+611x+6 and 2x+32x+3 are negative, so the fraction is positive.
If 32<x<611-\frac{3}{2} < x < -\frac{6}{11}, 11x+611x+6 is negative and 2x+32x+3 is positive, so the fraction is negative.
If x>611x > -\frac{6}{11}, both 11x+611x+6 and 2x+32x+3 are positive, so the fraction is positive.
So, the solution for the first inequality is x<32x < -\frac{3}{2} or x>611x > -\frac{6}{11}.
Now, let's solve the second 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 need to consider three intervals: x<6x < -6, 6<x<32-6 < x < -\frac{3}{2}, and x>32x > -\frac{3}{2}.
If x<6x < -6, both x+6x+6 and 2x+32x+3 are negative, so the fraction is positive.
If 6<x<32-6 < x < -\frac{3}{2}, x+6x+6 is positive and 2x+32x+3 is negative, so the fraction is negative.
If x>32x > -\frac{3}{2}, both x+6x+6 and 2x+32x+3 are positive, so the fraction is positive.
So, the solution for the second inequality is x<6x < -6 or x>32x > -\frac{3}{2}.
We need to find the intersection of the two solutions:
(x<32x < -\frac{3}{2} or x>611x > -\frac{6}{11}) and (x<6x < -6 or x>32x > -\frac{3}{2})
x<6x < -6 or x>32x > -\frac{3}{2}

3. Final Answer

x<6x < -6 or x>32x > -\frac{3}{2}

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