document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=148454>Question 148454</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The concentration, in parts per million, of a particular drug in a patient's blood x hours after the drug is administered is given by the function<BR>\n" );
document.write( "f(x)=-x^4+13x^3-47x^2+99x\r<BR>\n" );
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document.write( "How many hours after the drug is adminstered will it be eliminated from the bloodscream?\r<BR>\n" );
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document.write( "I used x=-b/2a and came up with 6. The answer was incorrect. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #108818 by </B><A HREF=/tutors/aboutme.mpl?userid=scott8148><B>scott8148(6628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=scott8148><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=scott8148><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=108818\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> x=-b/2a is for the axis of symmetry of a parabola __ highest order term is squared\r<BR>\n" );
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document.write( "factoring __ f(x)=(x)(-x^3+13x^2-47x+99)\r<BR>\n" );
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document.write( "factors of 99 __ ±1, ±3, ±9, ±11, ±33, ±99 __ testing the factors shows 9 as a solution </SPAN>\n" );
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