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OpenStudy (anonymous):
we're doing Rational Expressions and Rational functions the problem is: f(x)=9/x the answers I have are {x|x is a real number, x=/= 0} b. (-∞,0)U(0,∞ ) My question is how do you know what the answer is? I don't know how to figure this out on my own. if someone can explain what is going on that would be great.
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