document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=683822>Question 683822</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Solve x2+4x-7=0 using quadratic equation and then approximate answer to three decimal places using a calculator </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #423761 by </B><A HREF=/tutors/aboutme.mpl?userid=Jolliano><B>Jolliano(16)</B></A><img src=\"/images/stars/stars-06.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Jolliano><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=Jolliano><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=423761\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> USING COMPLETING THE SQUARE METHOD.<BR>\n" );
document.write( "X^2 + 4x - 7 = 0<BR>\n" );
document.write( "X^2 + 4x = 7<BR>\n" );
document.write( "Find half the coefficient of x,square it and then add it to both sides.<BR>\n" );
document.write( "X^2 + 4x + (2^2) = 7 + 2^2<BR>\n" );
document.write( "x^2 + 4x + 4 = 7 + 4 Factorise the L.H.S,<BR>\n" );
document.write( "(x + 2)^2 = 11<BR>\n" );
document.write( "Find the root of both sides,<BR>\n" );
document.write( "(x+2) = +&#8730; 11 or -&#8730; 11 Taking positive root first,<BR>\n" );
document.write( "x + 2 = 3.317 <BR>\n" );
document.write( "x = 3.317 - 2<BR>\n" );
document.write( "x = 1.317<BR>\n" );
document.write( "Taking negative root, x + 2 = -3.317<BR>\n" );
document.write( "x = -3.317 - 2<BR>\n" );
document.write( "x = -5.317 </SPAN>\n" );
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