Chapter 2: Problem 97
Describe how solving \(|x-3|=5\) is different from solving \(|x-3|<5\)
Short Answer
Expert verified
The equation \(|x-3|=5\) has two solutions (8 and -2), while the inequality \(|x-3|<5\) has a range of solutions between -2 and 8.
Step by step solution
01
Understanding the Absolute Value Equation
The equation \(|x-3|=5\) is an absolute value equation that indicates the distance between \(x\) and 3 is exactly 5. This can be interpreted as two separate equations: 1) \(x-3 = 5\)2) \(x-3 = -5\)
02
Solving the Absolute Value Equation
For the first equation, \(x-3 = 5\), solve by adding 3 to both sides to find \(x = 8\). For the second equation, \(x-3 = -5\), add 3 to both sides to find \(x = -2\). Thus, the solutions to \(|x-3|=5\) are \(x=8\) and \(x=-2\).
03
Understanding the Absolute Value Inequality
The inequality \(|x-3|<5\) describes all values of \(x\) that are less than 5 units away from 3. This creates a compound inequality:\(-5 < x-3 < 5\).
04
Solving the Absolute Value Inequality
To solve \(-5 < x-3 < 5\), add 3 to all parts of the inequality:\(-5 + 3 < x - 3 + 3 < 5 + 3\)This simplifies to \(-2 < x < 8\), indicating that \(x\) can be any value between \(-2\) and \(8\).
05
Comparing Equation and Inequality Solutions
The equation \(|x-3|=5\) results in two specific solutions, \(x=8\) and \(x=-2\). In contrast, the inequality \(|x-3|<5\) results in a range of solutions, specifically all \(x\) such that \(-2 < x < 8\).
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Absolute Value Equation
An absolute value equation like \(|x-3|=5\) reflects the distance between the variable and a specific number on a number line. Here, the equation tells us how far the number \(x\) is from 3 but in a precise manner. The absolute value \(|x-3|\) measures distances, meaning \(x\) can be either 5 units to the right or to the left of 3.
This leads to two potential equations:
This leads to two potential equations:
- \(x - 3 = 5\)
- \(x - 3 = -5\)
- For \(x - 3 = 5\), solving gives \(x = 8\).
- For \(x - 3 = -5\), solving gives \(x = -2\).
Absolute Value Inequality
An absolute value inequality, such as \(|x-3|<5\), broadens the concept of distance. Rather than pinpointing exact positions, it finds a range around a central point - in this case, 3. This inequality suggests numbers that are _less than 5 units away_ from 3. It creates a broader span rather than just two points.
This is rewritten as a compound inequality:
This is rewritten as a compound inequality:
- \(-5 < x - 3 < 5\)
- \(-2 < x < 8\)
Compound Inequality
A compound inequality combines two separate inequalities and portrays a range on the number line. When dealing with absolute value inequalities like \(|x - 3| < 5\), we split the simple inequality into two parts to form a compound one.
In essence, the inequality articulates two conditions at once:
Compound inequalities like these notate a continuous block of numbers and provide more flexible solutions than standalone, strict equalities.
In essence, the inequality articulates two conditions at once:
- \(-5 < x - 3\)
- \(x - 3 < 5\)
- This results in \(-2 < x < 8\).
Compound inequalities like these notate a continuous block of numbers and provide more flexible solutions than standalone, strict equalities.
Distance from a Point
Understanding absolute value through the lens of distance lends clarity to both equations and inequalities. In the equation \(|x-3|=5\), the expression conveys that \(x\) maintains a constant distance of 5 units from the point 3 on a number line.
Distances never manifest as negative values, reflecting a core principle of absolute values as measuring lengths or gaps regardless of direction. Whether moving left or right from 3, both directions are treated equally, instituting two possible solutions: one positive shift and one negative.
In the inequality \(|x-3|<5\), distances less than 5 ensure \(x\) remains in an area tightly surrounding 3. Interpreted as a range, this inequality encompasses every point within 5 units surrounding 3—crafting a centralized segment where countless potential answers exist. By considering absolute value as a matter of distance, understanding these concepts becomes more intuitive.
Distances never manifest as negative values, reflecting a core principle of absolute values as measuring lengths or gaps regardless of direction. Whether moving left or right from 3, both directions are treated equally, instituting two possible solutions: one positive shift and one negative.
In the inequality \(|x-3|<5\), distances less than 5 ensure \(x\) remains in an area tightly surrounding 3. Interpreted as a range, this inequality encompasses every point within 5 units surrounding 3—crafting a centralized segment where countless potential answers exist. By considering absolute value as a matter of distance, understanding these concepts becomes more intuitive.