Pre-calc function

  • Thread starter litz
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litz
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i was wondering, it says use interval notation to describe the domain of the real function, but a real function means the domain is a set of real numbers. does it mean all real numbers? i graphed it on my calculator and got [-9,10] but i have no idea if i should have negative infinity to positive infinity for all real numbers??

f(x)=square root of (x squared -3x+2). what's the domain!? :confused:
 

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  • #2
quantumdude
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Start small. Consider the function [itex]f(x)=\sqrt{x}[/itex]. If the function is to be real-valued, then what sort of numbers aren't we allowed to put in for x?
 

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