document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1179645>Question 1179645</A>: <I><SPAN STYLE=\"word-break: break-all;\"> a father is 30years iod and his son is 14 years; when in the past was the product of their age 80? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #809215 by </B><A HREF=/tutors/aboutme.mpl?userid=mananth><B>mananth(16946)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=mananth><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=mananth><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=809215\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> a father is 30years old and his son is 14 years; when in the past was the product of their age 80?\r<BR>\n" );
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document.write( "Let the product of their ages be 80, x years ago\r<BR>\n" );
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document.write( "(30-x)(14-x) =80\r<BR>\n" );
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document.write( "420 -30x-14x+x^2=80\r<BR>\n" );
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document.write( "x^2-44x+340=0<BR>\n" );
document.write( "(x - 34)(x - 10)=0\r<BR>\n" );
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document.write( "x=34 or 10\r<BR>\n" );
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document.write( "x=34 is absurd<BR>\n" );
document.write( "so x=10\r<BR>\n" );
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