April 2nd, 2004, 06:07 PM
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Second Lieutenant
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Join Date: Nov 2003
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Re: Math Question
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But isn't there always a positive AND negative number for any square root? If x is 0 for example you get f(0)=sqrt(4) Isn't that 2 or -2? Can someone explain why you don't count the -2?
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Geo, this is probably because you are working with functions. A function may only have one value in the range for each value in the domain.
So, in this case, the function sqrt() is defined to be positve .
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