document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=959129>Question 959129</A>: <I><SPAN STYLE=\"word-break: break-all;\"> What is the value of c so that y=x^2+15x+c is a perfect square trinomial </SPAN>\n" );
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document.write( "to be a  perfect square trinomial should be <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y=%28x%2Bc%29%5E2 ALIGN=MIDDLE  ALT=\"y=%28x%2Bc%29%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "recall the rule: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28x%2Bc%29%5E2=x%5E2%2B2%2A1%2Ac%2Bc%5E2 ALIGN=MIDDLE  ALT=\"%28x%2Bc%29%5E2=x%5E2%2B2%2A1%2Ac%2Bc%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "so, you have <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y=x%5E2%2B15x%2Bc ALIGN=MIDDLE  ALT=\"y=x%5E2%2B15x%2Bc\"   DISABLED_style= \"max-width:90%; height:auto;\" > and <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2%2A1%2Ac=2c=15 ALIGN=MIDDLE  ALT=\"2%2A1%2Ac=2c=15\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "then  the value of <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=c ALIGN=MIDDLE  ALT=\"c\"   DISABLED_style= \"max-width:90%; height:auto;\" > is   <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=15%2F2=7.5 ALIGN=MIDDLE  ALT=\"15%2F2=7.5\"   DISABLED_style= \"max-width:90%; height:auto;\" > \r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y=%28x%2B7.5%29%5E2+ ALIGN=MIDDLE  ALT=\"y=%28x%2B7.5%29%5E2+\"   DISABLED_style= \"max-width:90%; height:auto;\" > \r<BR>\n" );
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document.write( "so, <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+c+=+7.5 ALIGN=MIDDLE  ALT=\"+c+=+7.5\"   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
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