document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=620669>Question 620669</A>: <I><SPAN STYLE=\"word-break: break-all;\"> What is a function? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #390343 by </B><A HREF=/tutors/aboutme.mpl?userid=math-vortex><B>math-vortex(648)</B></A><img src=\"/images/stars/stars-11.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=math-vortex><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=math-vortex><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=390343\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Hi, there--<BR>\n" );
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document.write( "In mathematics, a function is a relation between a set of inputs called the domain and a set of outputs called the range with the property that each input is related to exactly one output. <BR>\n" );
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document.write( "One example of a function is defined by the rule f(x) = x^2, which relates an input x to the square of x. The domain of this function is the set of real numbers. The range is the set of non-negative real numbers.<BR>\n" );
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document.write( "Notice that no matter that number you choose from the domain, it is related to only one number in the range. For example 2-squared is four. There is no other answer.<BR>\n" );
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document.write( "In functions it may be the case that more than one number in the domain is related to a single number in the rangle (e.g. 3-squared is nine, and negative 3-squared is also nine.) This is OK, just not the other way around.<BR>\n" );
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document.write( "Hope this helps!<BR>\n" );
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document.write( "Ms.Figgy<BR>\n" );
document.write( "math.in.the.vortex@gmail.com\r<BR>\n" );
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