document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1075280>Question 1075280</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Determine whether the following numbers are zero of the polynomial equation. <BR>\n" );
document.write( "P(x)=x^3-2x^2+4x-8<BR>\n" );
document.write( "A). -2 <BR>\n" );
document.write( "B). 2i </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #689950 by </B><A HREF=/tutors/aboutme.mpl?userid=Boreal><B>Boreal(15235)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Boreal><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=Boreal><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=689950\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> I would substitute the numbers or graph for the real numbers<BR>\n" );
document.write( "for -2: -8-8-8-8 does not equal 0, so not a root<BR>\n" );
document.write( "2i: 8i^3-8i^2+8i-8=-8i+8+8i-8 does work.<BR>\n" );
document.write( "+2 is a root, so (x-2) is a factor<BR>\n" );
document.write( "the other factor is (x^2+4)<BR>\n" );
document.write( "The roots are 2, 2i, and -2i<BR>\n" );
document.write( "For the purposes of this question, B.<BR>\n" );
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document.write( "</TD></TR></TABLE>\n" );