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Unformatted text preview: ole numerator or denominator. So, if we factor a minus out of the numerator we could then
move it into the front of the rational expression as follows, x-3
- x + 3 - ( x - 3)
x +1 The moral here is that we need to be careful with moving minus signs around in rational
We now need to move into adding, subtracting, multiplying and dividing rational expressions.
Let’s start with multiplying and dividing rational expressions. The general formulas are as
follows, a c ac
b d bd © 2007 Paul Dawkins 44 http://tutorial.math.lamar.edu/terms.aspx College Algebra a
b = a ¸ c = a×d
b d bc
Note the two different forms for denoting division. We will use either as needed so make sure
you are familiar with both. Note as well that to do division of rational expressions all that we
need to do is multiply the numerator by the reciprocal of the denominator (i.e. the fraction with
the numerator and denominator switched).
Before doing a couple of examples there are a couple of special cases of...
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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