Chapter 2: Problem 21
For Problems \(17-30\), solve each inequality and graph the solution. $$ |x|>2 $$
Short Answer
Expert verified
The solution is \(x > 2\) or \(x < -2\).
Step by step solution
01
Understand Absolute Value Inequality
The inequality \(|x| > 2\) involves an absolute value, which means we are interested in values of \(x\) whose distance from 0 on a number line is greater than 2.
02
Break it into Two Inequalities
The inequality \(|x| > 2\) translates to two separate inequalities: \(x > 2\) or \(x < -2\). This happens because the absolute value of \(x\) being greater than 2 means that \(x\) is either more than 2 units away in the positive direction or more than 2 units away in the negative direction.
03
Solve Each Inequality
Solve each part separately: - For the inequality \(x > 2\), all values greater than 2 satisfy this condition.- For the inequality \(x < -2\), all values less than -2 satisfy this condition.
04
Graph the Solution
On a number line, the solutions to \(x > 2\) and \(x < -2\) are represented as open intervals. Draw an open circle at 2 and shade everything to the right to represent \(x > 2\). Similarly, draw an open circle at -2 and shade everything to the left to represent \(x < -2\).
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Using a Number Line Graph to Visualize Inequality Solutions
When you encounter an absolute value inequality like \(|x| > 2\), visualizing it on a number line can be incredibly helpful. Number lines allow us to see the range of values that satisfy the inequality. In this case, solutions to \(|x| > 2\) are shown as open intervals on the number line, which means we'll have two separate regions highlighted.
- Draw a line representing all possible values of \(x\).
- At the number 2, place an open circle. This indicates that 2 itself is not included in the solution set.
- Shade the region extending from this circle to the right to show \(x > 2\).
- Do the same on the opposite side. At -2, draw an open circle, then shade the region to the left to display \(x < -2\).
Solving Absolute Value Inequalities
Absolute value inequalities involve expressions where we're primarily concerned with how far a number is from zero on a number line. Understanding this distance concept helps in solving inequalities like \(|x| > 2\). To solve such an inequality, follow these steps:
Breaking Down the Inequality
- The absolute value inequality \(|x| > 2\) splits into two separate inequalities. This happens because \(x\) must satisfy one of two conditions: \(x > 2\) or \(x < -2\).
- The absolute value means that distance can be either direction from zero; hence, two situations arise.
Checking Each Side
- For \(x > 2\), every number greater than 2 meets the condition.
- For \(x < -2\), all numbers less than -2 are valid solutions.
Understanding Algebraic Expressions with Inequalities
Algebraic expressions in inequalities like \(|x| > 2\) can seem daunting, but breaking them down into understandable parts makes them more manageable. An absolute value expression focuses on the distance a number is from zero, which translates to potential values getting split into more manageable segments.
Algebraic Manipulation
- When handling the absolute value \(x\), think about what it "contains". In \(|x| > 2\), it indicates we're searching for values beyond a certain threshold.
- Translate this into algebraic terms: "greater than 2 units" or "less than -2 units" away.
Applying Rules to Solve
- Process each inequality derived from the absolute value separately. These are algebraic expressions themselves: \(x > 2\) and \(x < -2\).
- This algebraic partition allows us to apply basic inequality rules directly.