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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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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