document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=82821>Question 82821</A>: <I><SPAN STYLE=\"word-break: break-all;\"> this question is not from the book even though i put in the imformation. its from a worksheet that we were given in class. and i know this is kind of something i should already know but i have missed a few classes and i still dont get how write infinities and unions. the question is:\r<BR>\n" );
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document.write( "(x-5)(x+4)(1-x)<0\r<BR>\n" );
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document.write( "i have looked over the book for help and think that it might be something to the effect of (-4,-1) U (5,infinity)\r<BR>\n" );
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document.write( "am i on the right track? could someone please tell me? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #59402 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=59402\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> (x-5)(x+4)(1-x)<0 <BR>\n" );
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document.write( "To do problems like this you have to first of all <BR>\n" );
document.write( "find the values of x that make the left side zero.<BR>\n" );
document.write( "They are x=5,x=-4, and x=1.<BR>\n" );
document.write( "Then, draw a number line and find points <BR>\n" );
document.write( "left to right of -4,1,5.<BR>\n" );
document.write( "Those points break the number line into four intervals.<BR>\n" );
document.write( "You have to check a test point from each interval to see<BR>\n" );
document.write( "where the inequality is satisfied:<BR>\n" );
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document.write( "In (-inf,-4) pick x=-100; then f(-100) is -*-*+ >0; so (-inf,-4) is not part of the solution.<BR>\n" );
document.write( "In (-4,1) pick x=0; then f(0) is -*+*+ <0; so (-4,1) is part of the solution.\r<BR>\n" );
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document.write( "In (1,5) pick x=3; then f(3) is -*+*- >0; so (1,5) is not part of the solution.\r<BR>\n" );
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document.write( "In (5,inf) pick x=100; then f(100) is +*+*- <0; so (5,inf) is  part of the solution.<BR>\n" );
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document.write( "Final Answer (-4,1) U (5,inf)<BR>\n" );
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document.write( "You have it right.<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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