Stitz-Zeager_College_Algebra_e-book

If we want to make a prot then we need to solve p x 0

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Unformatted text preview: or c > 0, |x| < c is equivalent to −c < x < c. • For c ≤ 0, |x| < c has no solution. • For c ≥ 0, |x| > c is equivalent to x < −c or x > c. • For c < 0, |x| > c is true for all real numbers. As with Theorem 2.1 in Section 2.2, we could argue Theorem 2.3 using cases. However, in light of what we have developed in this section, we can understand these statements graphically. For instance, if c > 0, the graph of y = c is a horizontal line which lies above the x-axis through (0, c). To solve |x| < c, we are looking for the x values where the graph of y = |x| is below the graph of y = c. We know the graphs intersect when |x| = c, which, from Section 2.2, we know happens when x = c or x = −c. Graphing, we get y (−c, c) −c (c, c) c x We see the graph of y = |x| is below y = c for x between −c and c, and hence we get |x| < c is equivalent to −c < x < c. The other properties in Theorem 2.3 can be shown similarly. Example 2.4.3. Solve the fo...
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This note was uploaded on 05/03/2013 for the course MATH Algebra taught by Professor Wong during the Fall '13 term at Chicago Academy High School.

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