Question 212 of 480
What are the integer values of x which satisfy the inequality -1 < 3 -2x \(\leq\) 5?
- A. -1. 0, 1, 2
- B. -2, 1, 0 , -1
- C. 0, 1, 2
- D. -1, 0, 1
Correct Answer:
D
Explanation
To solve the inequality \(-1 < 3 - 2x \leq 5\), we will break it down into two parts and solve each part step-by-step.
### Step 1: Break Down the Compound Inequality
The compound inequality consists of two parts:
1. \(-1 < 3 - 2x\)
2. \(3 - 2x \leq 5\)
We will solve each part separately.
### Step 2: Solve the First Inequality \(-1 < 3 - 2x\)
1. **Isolate the term with \(x\)**:
\[
-1 < 3 - 2x
\]
Subtract 3 from both sides:
\[
-1 - 3 < -2x
\]
This simplifies to:
\[
-4 < -2x
\]
2. **Divide by -2** (remember to reverse the inequality sign when dividing by a negative number):
\[
\frac{-4}{-2} > x
\]
This simplifies to:
\[
2 > x \quad \text{or} \quad x < 2
\]
### Step 3: Solve the Second Inequality \(3 - 2x \leq 5\)
1. **Isolate the term with \(x\)**:
\[
3 - 2x \leq 5
\]
Subtract 3 from both sides:
\[
-2x \leq 5 - 3
\]
This simplifies to:
\[
-2x \leq 2
\]
2. **Divide by -2** (again, reverse the inequality sign):
\[
x \geq \frac{2}{-2}
\]
This simplifies to:
\[
x \geq -1
\]
### Step 4: Combine the Results
Now we have two inequalities:
1. \(x < 2\)
2. \(x \geq -1\)
Combining these gives us:
\[
-1 \leq x < 2
\]
### Step 5: Determine the Integer Solutions
The integer values of \(x\) that satisfy \(-1 \leq x < 2\) are:
- \(-1\)
- \(0\)
- \(1\)
### Conclusion: Correct Option
The integer values of \(x\) that satisfy the inequality are \(-1, 0, 1\). Therefore, the correct option is **D**.
### Explanation of Other Options
- **Option A: -1, 0, 1, 2**: This option includes 2, which does not satisfy the inequality \(x < 2\).
- **Option B: -2, 1, 0, -1**: This option includes -2, which does not satisfy the lower bound \(x \geq -1\).
- **Option C: 0, 1, 2**: This option includes 2, which again does not satisfy \(x < 2\).
### Revision Summary
- Solve compound inequalities by breaking them into parts.
- Isolate the variable and remember to reverse the inequality sign when dividing by a negative number.
- Combine the results to find the range of possible values.
- Check each option against the derived solution to confirm correctness.