document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=606718>Question 606718</A>: <I><SPAN STYLE=\"word-break: break-all;\"> how to show X^2+4x+5 is not one -one? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #382282 by </B><A HREF=/tutors/aboutme.mpl?userid=richard1234><B>richard1234(7193)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=richard1234><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=richard1234><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=382282\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> If it were one-to-one, every x would map to exactly one output (or y-value) and vice versa. Since x = 0 and x = 4 yield the same value, 5, the function f(x) = x^2 + 4x + 5 is not one-to-one.\r<BR>\n" );
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document.write( "You can also show it by graphing the function.\r<BR>\n" );
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