--- loncom/homework/templates/functionplottwo.problem	2010/11/13 13:58:55	1.3
+++ loncom/homework/templates/functionplottwo.problem	2010/11/24 02:53:18	1.4
@@ -3,7 +3,7 @@
 <startouttext />
 Make a sketch of the electrostatic potential (zero at infinity) of a negative point charge located at x=$x m.
 <endouttext />
-<functionplotresponse xaxisvisible="yes" xlabel="x [m]" gridvisible="yes" ylabel="V(x) [V]" id="11" xmax="30" yaxisvisible="yes" xmin="-4" ymin="-10" ymax="10">
+<functionplotresponse xaxisvisible="yes" xlabel="x [m]" gridvisible="yes" ylabel="V(x) [V]" id="11" xmax="30" yaxisvisible="yes" xmin="-4" ymin="-10" ymax="10" answerdisplay="-4/abs(x-$x)">
 <functionplotelements>
 <spline initx="-2" inity="0" index="A" order="2" scalex="4" />
 <spline index="B" order="2" initx="12" inity="0" scalex="4" />