Carroll Riley
03/30/2024 · High School
Solve: \( |2 x+1| \geq 5 \) Glve your answer as an interval or union of intervals. Only use integers or fractions, no decimal
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Tutor-Verified Answer
Step-by-step Solution
To solve the inequality \( |2x + 1| \geq 5 \), we need to consider the definition of absolute value. The expression \( |A| \geq B \) implies two cases:
1. \( A \geq B \)
2. \( A \leq -B \)
In our case, we have:
1. \( 2x + 1 \geq 5 \)
2. \( 2x + 1 \leq -5 \)
Let's solve each case separately.
**Case 1: \( 2x + 1 \geq 5 \)**
Subtract 1 from both sides:
\[
2x \geq 4
\]
Now, divide by 2:
\[
x \geq 2
\]
**Case 2: \( 2x + 1 \leq -5 \)**
Subtract 1 from both sides:
\[
2x \leq -6
\]
Now, divide by 2:
\[
x \leq -3
\]
Now we combine the results from both cases. The solution to the inequality \( |2x + 1| \geq 5 \) is:
\[
x \leq -3 \quad \text{or} \quad x \geq 2
\]
In interval notation, this is expressed as:
\[
(-\infty, -3] \cup [2, \infty)
\]
Thus, the final answer is:
\[
\boxed{(-\infty, -3] \cup [2, \infty)}
\]
Quick Answer
\[
(-\infty, -3] \cup [2, \infty)
\]
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