document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=80479>Question 80479</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Solve the equation. (y-3) (y+7)=0 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #57733 by </B><A HREF=/tutors/aboutme.mpl?userid=checkley75><B>checkley75(3666)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=checkley75><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=57733\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> (y-3)(y+7)=0<BR>\n" );
document.write( "y^2-3y+7y-21=0<BR>\n" );
document.write( "y^2+4y-21=0<BR>\n" );
document.write( "--------------------------------------<BR>\n" );
document.write( "one way to check his is to use the quadratic equation ay^2+by+c:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+ ALIGN=MIDDLE  ALT=\"y+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" > <BR>\n" );
document.write( "then you'll see that: <BR>\n" );
document.write( "y-3=0<BR>\n" );
document.write( "y=3 <BR>\n" );
document.write( "&<BR>\n" );
document.write( "y+7=0<BR>\n" );
document.write( "y=-7 </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );