Solving Inequalities: Cases and Solutions for \frac{3}{|x+1|-1}+\frac{2}{x}<1

In summary, the problem involves two cases: when x is greater than or equal to 0, the solution is x> 5. When x is less than 0, the solution set is -4 < x < 1.
  • #1
XJellieBX
40
0
Problem:
[tex]\frac{3}{|x+1|-1}[/tex]+[tex]\frac{2}{x}[/tex]<1

My Solution:
There are 2 cases:
1) x[tex]\geq0[/tex],[tex]\frac{3}{x+1-1}[/tex]+[tex]\frac{2}{x}[/tex]<1
[tex]\frac{3}{x}[/tex]+[tex]\frac{2}{x}[/tex]<1
And you end up with... x>5.

2) x<0, [tex]\frac{3}{-x-1-1}[/tex]+[tex]\frac{2}{x}[/tex]<1
[tex]\frac{3x-2x-4}{-x^{2}-2x}[/tex]<1
... a few reductions later...
[tex]x^{2}[/tex]+3x-4>0
And the solution set for this case is, -4>x>1

My Question:
Is there something I'm missing or something else I need to do?
 
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  • #2
(edited: incorrect response)
 
Last edited:
  • #3
"-4 > x> 1" implies -4> 1! x2+ 3x- 4= (x+ 4)(x- 1)> 0 if and only if the two factors are of the same sign. x+4> 0, x- 1> 0 give x> -4 and x> 1 which are both satisfied for x> 1. x+4< 0, x-1< 0 give x< -4, x< 1 which are both satisfied for x< -4.
x2+ 3x- 4> 0 for x< -4 OR x> 1.
 

1. What are the steps to solve this inequality?

To solve this inequality, we need to follow these steps:

Step 1: Simplify the expression by using the distributive property and combining like terms.

Step 2: Isolate the absolute value expression by using inverse operations.

Step 3: Create two separate cases by setting the absolute value expression equal to both positive and negative values.

Step 4: Solve each case separately by using algebraic methods.

Step 5: Combine the solutions from both cases and determine the final solution set.

2. How do we handle the absolute value in this inequality?

The absolute value in this inequality can be handled by creating two separate cases. In one case, we set the absolute value expression equal to a positive value and in the other case, we set it equal to a negative value. This allows us to solve for both possible solutions and combine them to determine the final solution set.

3. Can we use graphical methods to solve this inequality?

Yes, we can use graphical methods to solve this inequality. We can graph the two separate cases created by setting the absolute value expression equal to positive and negative values. The solution set would be the values on the x-axis that are shaded in both graphs.

4. Are there any restrictions on the variable x in this inequality?

Yes, there is a restriction on the variable x in this inequality. Since there is a denominator of |x+1|-1, x+1 cannot equal 1, otherwise it would result in a division by 0. Therefore, x cannot equal -2.

5. Can we check our solution to this inequality?

Yes, we can check our solution to this inequality by plugging in the values from the solution set into the original inequality. If the inequality holds true, then we have found the correct solution.

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