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Unformatted text preview: x = 2 . That means that we’ll need to
avoid those two numbers. However, all the other values of x will work since they don’t give
division by zero. The domain is then, © 2007 Paul Dawkins 183 http://tutorial.math.lamar.edu/terms.aspx College Algebra Domain : All real numbers except x = -5 and x = 2
[Return to Problems] (b) f ( x ) = 5 - 3 x
In this case we won’t have division by zero problems since we don’t have any fractions. We do
have a square root in the problem and so we’ll need to worry about taking the square root of a
This one is going to work a little differently from the previous part. In that part we determined
the value(s) of x to avoid. In this case it will be just as easy to directly get the domain. To avoid
square roots of negative numbers all that we need to do is require that 5 - 3x ³ 0 This is a fairly simple linear inequality that we should be able to solve at this point. 5 ³ 3x Þ x£ 5
3 The domain of this function is then, Domain : x £ 5
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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.
- Spring '12