document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=167373>Question 167373</A>This question is from textbook <A HREF=http://www.amazon.com/exec/obidos/ASIN/0321269470/algebrahomeworkh>Introductory Algebra</A><BR>\n" );
document.write( ": <I><SPAN STYLE=\"word-break: break-all;\"> Please factor:\r<BR>\n" );
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document.write( "(a + 4)^2 - 2(a + 4) + 1 </SPAN>\n" );
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document.write( " (a +4 )^2 - 2(a + 4 ) +1 =0  \r<BR>\n" );
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document.write( "consider a + 4 = x\r<BR>\n" );
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document.write( " i.e .  x^2 - 2x +1 =0\r<BR>\n" );
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document.write( "          x^2 -1x -1x +1 = 0 <BR>\n" );
document.write( "            x ( x - 1 ) - 1 ( x -1) = 0<BR>\n" );
document.write( "                  (x -1) (x -1) =0<BR>\n" );
document.write( "                     x = 1\r<BR>\n" );
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document.write( "                 but x = a + 4 <BR>\n" );
document.write( "                  a + 4 = 1<BR>\n" );
document.write( "                     a = 1 - 4 <BR>\n" );
document.write( "                        = 1 + -4 = -3 <BR>\n" );
document.write( "        <BR>\n" );
document.write( "          </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );