document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=146268>Question 146268</A>: <I><SPAN STYLE=\"word-break: break-all;\">  Find the domain of   f(t)=(t+3)/(t(t+2))\r<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #106812 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=106812\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=f%28t%29=%28t%2B3%29%2F%28t%28t%2B2%29%29 ALIGN=MIDDLE  ALT=\"f%28t%29=%28t%2B3%29%2F%28t%28t%2B2%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > Start with the given function\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t%28t%2B2%29=0 ALIGN=MIDDLE  ALT=\"t%28t%2B2%29=0\"   DISABLED_style= \"max-width:90%; height:auto;\" > Set the denominator equal to zero. Remember, dividing by 0 is undefined. So if we find values of t that make the denominator zero, then we must exclude them from the domain.\r<BR>\n" );
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document.write( "Set each factor equal to zero:\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t=0 ALIGN=MIDDLE  ALT=\"t=0\"   DISABLED_style= \"max-width:90%; height:auto;\" > or <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t%2B2=0 ALIGN=MIDDLE  ALT=\"t%2B2=0\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t=0 ALIGN=MIDDLE  ALT=\"t=0\"   DISABLED_style= \"max-width:90%; height:auto;\" > or <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t=-2 ALIGN=MIDDLE  ALT=\"t=-2\"   DISABLED_style= \"max-width:90%; height:auto;\" > Now solve for t in each case\r<BR>\n" );
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document.write( "So our solutions are <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t=0 ALIGN=MIDDLE  ALT=\"t=0\"   DISABLED_style= \"max-width:90%; height:auto;\" > or <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t=-2 ALIGN=MIDDLE  ALT=\"t=-2\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "Since <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t=-2 ALIGN=MIDDLE  ALT=\"t=-2\"   DISABLED_style= \"max-width:90%; height:auto;\" > and <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t=0 ALIGN=MIDDLE  ALT=\"t=0\"   DISABLED_style= \"max-width:90%; height:auto;\" > make the denominator equal to zero, this means we must exclude <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t=-2 ALIGN=MIDDLE  ALT=\"t=-2\"   DISABLED_style= \"max-width:90%; height:auto;\" > and <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t=0 ALIGN=MIDDLE  ALT=\"t=0\"   DISABLED_style= \"max-width:90%; height:auto;\" > from our domain\r<BR>\n" );
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document.write( "So our domain is:  <IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\LARGE \textrm{\left{t|t\in\mathbb{R} t\neq-2 and t\neq0\right}}\">\r<BR>\n" );
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document.write( "which in plain English reads: t is the set of all real numbers except <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t%3C%3E-2 ALIGN=MIDDLE  ALT=\"t%3C%3E-2\"   DISABLED_style= \"max-width:90%; height:auto;\" > or <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t%3C%3E0 ALIGN=MIDDLE  ALT=\"t%3C%3E0\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "So our domain looks like this in interval notation\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\Large \left(-\infty, -2\right)\cup\left(-2,0 \right)\cup\left(0,\infty \right)\">\r<BR>\n" );
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document.write( "note: remember, the parenthesis <font size=4><b>excludes</b></font> -2 and 0 from the domain\r<BR>\n" );
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document.write( "If we wanted to graph the domain on a number line, we would get:\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=drawing%28500%2C50%2C-10%2C10%2C-10%2C10%2C%0D%0Anumber_line%28+500%2C+-11%2C+9%29%2C%0D%0Ablue%28line%28-0.5%2C-7%2C0.65%2C-7%29%29%2C%0D%0Ablue%28line%28-0.5%2C-6%2C0.65%2C-6%29%29%2C%0D%0Ablue%28line%28-0.5%2C-5%2C0.65%2C-5%29%29%2C%0D%0Ablue%28arrow%281.5%2C-7%2C10%2C-7%29%29%2C%0D%0Ablue%28arrow%281.5%2C-6.5%2C10%2C-6.5%29%29%2C%0D%0Ablue%28arrow%281.5%2C-6%2C10%2C-6%29%29%2C%0D%0Ablue%28arrow%281.5%2C-5.5%2C10%2C-5.5%29%29%2C%0D%0Ablue%28arrow%281.5%2C-5%2C10%2C-5%29%29%2C%0D%0Ablue%28arrow%28-1.5%2C-7%2C-10%2C-7%29%29%2C%0D%0Ablue%28arrow%28-1.5%2C-6.5%2C-10%2C-6.5%29%29%2C%0D%0Ablue%28arrow%28-1.5%2C-6%2C-10%2C-6%29%29%2C%0D%0Ablue%28arrow%28-1.5%2C-5.5%2C-10%2C-5.5%29%29%2C%0D%0Ablue%28arrow%28-1.5%2C-5%2C-10%2C-5%29%29%2C%0D%0A%0D%0Acircle%28-1%2C-5.8%2C0.35%29%2C%0D%0Acircle%28-1%2C-5.8%2C0.4%29%2C%0D%0Acircle%28-1%2C-5.8%2C0.45%29%2C%0D%0A%0D%0A%0D%0Acircle%281%2C-5.8%2C0.35%29%2C%0D%0Acircle%281%2C-5.8%2C0.4%29%2C%0D%0Acircle%281%2C-5.8%2C0.45%29%0D%0A%0D%0A%0D%0A%29 ALIGN=MIDDLE   DISABLED_style= \"max-width:90%; height:auto;\" > Graph of the domain in blue and the excluded values represented by open circles\r<BR>\n" );
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document.write( "Notice we have a continuous line until we get to the holes at <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t=-2 ALIGN=MIDDLE  ALT=\"t=-2\"   DISABLED_style= \"max-width:90%; height:auto;\" > and <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t=0 ALIGN=MIDDLE  ALT=\"t=0\"   DISABLED_style= \"max-width:90%; height:auto;\" > (which is represented by the open circles).<BR>\n" );
document.write( "This graphically represents our domain in which t can be any number except t cannot equal -2 or 0\r<BR>\n" );
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