document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=203772>Question 203772</A>: <I><SPAN STYLE=\"word-break: break-all;\"> For the given rational function f, find all values of x for which f(x) has the indicated value.\r<BR>\n" );
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document.write( "f(x) = 5x + 21/x ; f(x) = -38 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #153746 by </B><A HREF=/tutors/aboutme.mpl?userid=RAY100><B>RAY100(1637)</B></A><img src=\"/images/stars/stars-12.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=RAY100><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=153746\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> f(x) = -38 = 5x +21/x<BR>\n" );
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document.write( "mult  thru  by  x<BR>\n" );
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document.write( "-38x = 5x^2 +21<BR>\n" );
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document.write( "0=5x^2 +38x +21<BR>\n" );
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document.write( "factor<BR>\n" );
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document.write( "(5x+3)(x+7) =0<BR>\n" );
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document.write( "x= -3/5,,,-7<BR>\n" );
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document.write( "check<BR>\n" );
document.write( "(-7),,,-38=5(-7) +21/(-7)<BR>\n" );
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document.write( "-38 = -35 -3,,,,,,ok<BR>\n" );
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document.write( "(-3/5),,,,,-38 =5(-3/5) + 21/(-3/5)<BR>\n" );
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document.write( "-38 = -3 -35 = -38,,,,,ok\r<BR>\n" );
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document.write( " </SPAN>\n" );
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