document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1101636>Question 1101636</A>: <I><SPAN STYLE=\"word-break: break-all;\"> <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=f%28x%29=x%5E2-5 ALIGN=MIDDLE  ALT=\"f%28x%29=x%5E2-5\"   DISABLED_style= \"max-width:90%; height:auto;\" >; x is greater than or equal to zero \r<BR>\n" );
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document.write( "Why is this a one-to-one function? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #716238 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=716238\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> f(x)=x^2-5 ; x is greater than or equal to zero \r<BR>\n" );
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document.write( "Why is this a one-to-one function?<BR>\n" );
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document.write( "Because you are restricting a parabola to its right half.<BR>\n" );
document.write( "A parabola symetric to the y-axis is not one-to-one, but<BR>\n" );
document.write( "the right half is one-to-one (so is the left half).<BR>\n" );
document.write( "To see that, draw the figure.<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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