document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=721854>Question 721854</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I cant seem to figure out how x squared+x-12 works </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #442536 by </B><A HREF=/tutors/aboutme.mpl?userid=josmiceli><B>josmiceli(19441)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josmiceli><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=josmiceli><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=442536\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> (1)  It's a function. You can call it f(x), or <BR>\n" );
document.write( "a function of x.<BR>\n" );
document.write( "That means that there is 1 and only 1 value of f(x)<BR>\n" );
document.write( "for each value of x.<BR>\n" );
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document.write( "If there were 2 possible values of f(x) for a certain x,<BR>\n" );
document.write( "then it would be disqualified as a function.<BR>\n" );
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document.write( "(2) It's a 2nd degree equation, also called a parabola<BR>\n" );
document.write( "Here's the plot:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+graph%28+400%2C+400%2C+-5%2C+5%2C+-16%2C+5%2C+x%5E2+%2B+x+-+12+%29+ ALIGN=MIDDLE  ALT=\"+graph%28+400%2C+400%2C+-5%2C+5%2C+-16%2C+5%2C+x%5E2+%2B+x+-+12+%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "---------------<BR>\n" );
document.write( "You can see that there are 2 x-crossings, called roots. That is a feature<BR>\n" );
document.write( "of 2nd degree equations- 2 real roots. If there were no<BR>\n" );
document.write( "x-crossings at all, then there would still be 2 roots,<BR>\n" );
document.write( "but they would be imaginary. <BR>\n" );
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document.write( "Hope this helps\r<BR>\n" );
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