Or in other words we must have 2 x 1 4 x 9

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Unformatted text preview: ns that involve an absolute value being equal to a number, but there is no reason to think that there has to only be a number on the other side of the equal sign. Likewise, there is no reason to think that we can only have one absolute value in the problem. So, we need to take a look at a couple of these kinds of equations. Example 3 Solve each of the following. (a) x - 2 = 3 x + 1 [Solution] (b) 4 x + 3 = 3 - x [Solution] (c) 2 x - 1 = 4 x + 9 [Solution] Solution At first glance the formula we used above will do us no good here. It requires the right side of the © 2007 Paul Dawkins 143 http://tutorial.math.lamar.edu/terms.aspx College Algebra equation to be a positive number. It turns out that we can still use it here, but we’re going to have to be careful with the answers as using this formula will, on occasion introduce an incorrect answer. So, while we can use the formula we’ll need to make sure we check our solutions to see if they really work. (a) x - 2 = 3 x + 1 So, we’ll start off using the formula above as we have in the previous pr...
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This note was uploaded on 06/06/2012 for the course ICT 4 taught by Professor Mrvinh during the Spring '12 term at Hanoi University of Technology.

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