document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=637777>Question 637777</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The solutions to a quadratic equation are -4 and 4.  What is the equation of its axis of symmetry?<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #401873 by </B><A HREF=/tutors/aboutme.mpl?userid=lwsshak3><B>lwsshak3(11628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=lwsshak3><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=401873\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The solutions to a quadratic equation are -4 and 4. What is the equation of its axis of symmetry?<BR>\n" );
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document.write( "Solutions to quadratic equations are zeros or x-intercepts<BR>\n" );
document.write( "Given equation: y=(x+4)(x-4)=x^2-16 (difference of 2-squares)<BR>\n" );
document.write( "Since this is a parabola that opens upwards, equation of axis of symmetry is x=0 (vertical line between -4 and 4 on the x-axis) </SPAN>\n" );
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