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The following expressions in examples aren't polynomial expressions:

$$2x^2-5x+(3/x)$$ $$9- \sqrt x$$

Neither they are rational expressions, I've been just told that by book. but then what do you call them?

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    Functions?${}{}$2011-10-09
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    The first one is a rational function: $$2x^2-5x+3/x=\frac{2x^3-5x^2+3}{x}$$2011-10-09
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    I'm not sure what the context is, but under many understandings the first one could be called rational.2011-10-09

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