document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=243233>Question 243233</A>: <I><SPAN STYLE=\"word-break: break-all;\"> solve t^2=9 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #178207 by </B><A HREF=/tutors/aboutme.mpl?userid=oberobic><B>oberobic(2304)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=oberobic><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=178207\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Subtract 9 from both sides.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x%5E2+-9+=+0 ALIGN=MIDDLE  ALT=\"x%5E2+-9+=+0\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "I hope you see that you can factor this easily because 9 is a perfect square (3*3), and that you do not need an 'x' value, and that it is -9.<BR>\n" );
document.write( "...<BR>\n" );
document.write( "If you memorized <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x%5E2+-1+=+%28x%2B1%29%28x-1%29 ALIGN=MIDDLE  ALT=\"x%5E2+-1+=+%28x%2B1%29%28x-1%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > you can substitute any perfect square for the '1'.<BR>\n" );
document.write( "...<BR>\n" );
document.write( "So the solution is,<BR>\n" );
document.write( "(x+3)(x-3)=0<BR>\n" );
document.write( "...<BR>\n" );
document.write( "So, x can = 3 or -3.<BR>\n" );
document.write( "That is the same as saying the square root of 9 can be either +3 or - 3, which is true.<BR>\n" );
document.write( "...<BR>\n" );
document.write( "That suggests we could have solved the problem by taking the square root of each side first.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sqrt%28x%5E2%29=sqrt%289%29 ALIGN=MIDDLE  ALT=\"sqrt%28x%5E2%29=sqrt%289%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "...<BR>\n" );
document.write( "The square root of x^2 is simply + or - x.<BR>\n" );
document.write( "The square root of 9 is simply + or - 3. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );