document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=177981>Question 177981</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Find a value for k that will make 4x^2 + 6.4 x + k a perfect square. Describe the procedure that you used which requires algebra [that is, not trial and error].   \r<BR>\n" );
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document.write( "been on this 1 for awhile just can't find the appropiate equation to make it work. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #132958 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=132958\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Find a value for k that will make 4x^2 + 6.4 x + k a perfect square. <BR>\n" );
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document.write( "4x^2 + 6.4x + k<BR>\n" );
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document.write( "Factor out the \"4\" to get:<BR>\n" );
document.write( "4(x^2 = 1.6x + ?<BR>\n" );
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document.write( "Add the square of half the coefficient of \"x\"<BR>\n" );
document.write( "4(x^2 + 1.6x + (1.6/2)^2)\r<BR>\n" );
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document.write( "k = (1.6/2)^2 = 0.8^2 = 0.64<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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