When we talk about the “opposite of a number,” we’re specifically talking about the positive and negative versions of the same number. Now that’s not a technical definition by any means, so let me show you what I mean.
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In this lesson we’ll look at how to find the length of a line segment algebraically when we’re given information and measurements about parts of the line segment. Remember that a line segment is a finite piece of a line, named by its endpoints.
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The absolute value operation turns any value inside it into its distance from the origin, essentially turning both positive and negative numbers into only positive numbers. Always calculate the value inside the absolute value first, then apply the absolute value last.
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