loncom/homework/templates/SimpleFormula.problem - diff

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-version 1.4, 2004/08/19 20:29:22
+version 1.7, 2009/07/06 17:12:47
  Line 1
  <problem>
- <script type="loncapa/perl">$z=&random(1,10,1);
- $constant=&random(1,10,1);
+ <script type="loncapa/perl">
- # y=x+z-constant, solving for x, x=y-z+constant, prettyconstant is for simplifying
+ $k=&random(3,6,1);
- $prettyconstant=$constant-$z;
+ $formula="a*x^$k";
- $x="y+$prettyconstant";
+ $m=$k-1;
- # code below substitutes '+-' and '-+' for '-'.  This is used in display of answer
+ $derivative="$k*a*x^$m";
- $x=~s/\+-/-/g;
+ </script>
- $x=~s/-\+/-/g;</script>
+ <startouttext />
- <startouttext />If z=$z and y=x+z-$constant, what does x equal?
+ What is the derivative of <tt>$formula</tt> with respect to x?
  <endouttext />
- <formularesponse samples="y@-5:5#10" answer="$x">
+ <formularesponse samples="a,x@-3,-3:3,3#4" answer="$derivative">
      <responseparam description="Numerical Tolerance" type="tolerance" default="0.00001" name="tol" />
      <textline size="25" />
  </formularesponse>
  </problem>