document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=405550>Question 405550</A>: <I><SPAN STYLE=\"word-break: break-all;\"> if f(x)=x^2-7x find f(a+1)-f(a) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #286442 by </B><A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><B>jim_thompson5910(35256)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><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=286442\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> f(x)=x^2-7x<BR>\n" );
document.write( "f(a)=a^2-7a<BR>\n" );
document.write( "f(a+1)=(a+1)^2-7(a+1)=a^2+2a+1-7a-7=a^2-5a-6\r<BR>\n" );
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document.write( "So f(a+1)-f(a) = a^2-5a-6 - (a^2-7a) = a^2-5a-6-a^2+7a = 2a-6 \r<BR>\n" );
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document.write( "or in short f(a+1)-f(a) = 2a-6 \r<BR>\n" );
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document.write( "Jim </SPAN>\n" );
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