document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=753459>Question 753459</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Could you please help me to solve this:<BR>\n" );
document.write( "Using the quadratic formula solve: 2x^2 + 4x - 7 = 0<BR>\n" );
document.write( "Thanks a lot<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 #458391 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=458391\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Have you covered completing the square?<BR>\n" );
document.write( "That's how I would do it.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+2x%5E2+%2B+4x+-+7+=+0+ ALIGN=MIDDLE  ALT=\"+2x%5E2+%2B+4x+-+7+=+0+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Divide both sides by <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+2+ ALIGN=MIDDLE  ALT=\"+2+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+x%5E2+%2B+2x+-+7%2F2+=+0+ ALIGN=MIDDLE  ALT=\"+x%5E2+%2B+2x+-+7%2F2+=+0+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Add <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+7%2F2+ ALIGN=MIDDLE  ALT=\"+7%2F2+\"   DISABLED_style= \"max-width:90%; height:auto;\" > to both sides<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+x%5E2+%2B+2x+=+7%2F2+ ALIGN=MIDDLE  ALT=\"+x%5E2+%2B+2x+=+7%2F2+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Take <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+1%2F2+ ALIGN=MIDDLE  ALT=\"+1%2F2+\"   DISABLED_style= \"max-width:90%; height:auto;\" > of the co-efficient of the<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+x+ ALIGN=MIDDLE  ALT=\"+x+\"   DISABLED_style= \"max-width:90%; height:auto;\" > term, square it, then add it to <BR>\n" );
document.write( "both sides<BR>\n" );
document.write( "-------------<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+x%5E2+%2B+2x+%2B+%28+2%2F2+%29%5E2+=+7%2F2+%2B+%28+2%2F2+%29%5E2+ ALIGN=MIDDLE  ALT=\"+x%5E2+%2B+2x+%2B+%28+2%2F2+%29%5E2+=+7%2F2+%2B+%28+2%2F2+%29%5E2+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+x%5E2+%2B+2x+%2B+1+=+7%2F2+%2B+1+ ALIGN=MIDDLE  ALT=\"+x%5E2+%2B+2x+%2B+1+=+7%2F2+%2B+1+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+x%5E2+%2B+2x+%2B+1+=+9%2F2+ ALIGN=MIDDLE  ALT=\"+x%5E2+%2B+2x+%2B+1+=+9%2F2+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+%28+x+%2B+1+%29%5E2+=+9%2F2+ ALIGN=MIDDLE  ALT=\"+%28+x+%2B+1+%29%5E2+=+9%2F2+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Take the square root of both sides<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+x+%2B+1+=+3+%2F+sqrt%282%29+ ALIGN=MIDDLE  ALT=\"+x+%2B+1+=+3+%2F+sqrt%282%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+x+=+-1+%2B+3+%2F+sqrt%282%29+ ALIGN=MIDDLE  ALT=\"+x+=+-1+%2B+3+%2F+sqrt%282%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "and also<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+x+%2B+1+=+-3+%2F+sqrt%282%29+ ALIGN=MIDDLE  ALT=\"+x+%2B+1+=+-3+%2F+sqrt%282%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+x+=+-1+-+3+%2F+sqrt%282%29+ ALIGN=MIDDLE  ALT=\"+x+=+-1+-+3+%2F+sqrt%282%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "-----------------------<BR>\n" );
document.write( "These are the 2 answers. You can \"clean them up\"<BR>\n" );
document.write( "by multiplying the 2nd term by <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+sqrt%282%29+%2F+sqrt%282%29+ ALIGN=MIDDLE  ALT=\"+sqrt%282%29+%2F+sqrt%282%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "That will give you:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+x+=+-1+%2B+3%2Asqrt%282%29+%2F+2+ ALIGN=MIDDLE  ALT=\"+x+=+-1+%2B+3%2Asqrt%282%29+%2F+2+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+x+=+-1+-+3%2Asqrt%282%29+%2F+2+ ALIGN=MIDDLE  ALT=\"+x+=+-1+-+3%2Asqrt%282%29+%2F+2+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "-----------------------<BR>\n" );
document.write( "Also, you can check both answers by plugging them<BR>\n" );
document.write( "back into original equation. <BR>\n" );
document.write( "Hope this helps\r<BR>\n" );
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document.write( "</TD></TR></TABLE>\n" );