In revising some working problems that are written for rather stilted str_cmp

type answers I decided to try out contextLimitedPolynomial. I seem to have

done something quite wrong, but the warning message leaves me puzzled. In

particular, besides the error message, it gives me the answer of a number although I can't see anywhere that x is given a value.

Here is the code

#DESCRIPTION

##Type of

#ENDDESCRIPTION

DOCUMENT();

loadMacros(

"PGstandard.pl",

"PGchoicemacros.pl",

#"PGgraphmacros.pl",

"MathObjects.pl",

# "compoundProblem.pl",

# "unionLists.pl",

#"unionMacros.pl",

"contextLimitedPolynomial.pl",

);

Context("Numeric");

Context()->variables->are(x=>'Real',y=>'Real');

TEXT(beginproblem());

$showPartialCorrectAnswers = 1;

$a = random(6,9,1);

$b = random(3,7,1);

$e=random(2,6,2);

$f=random(3,7,2);

BEGIN_TEXT

$PAR

Simplify each of the following expressions

$PAR

\(($a+$b x^2+$e x^3)($f x-12(x+1))\)= \{ans_rule(15)\}

$PAR

END_TEXT

Context("LimitedPolynomial")->flags->set(singlePowers=>1);

Context()->variables->are(x=>'Real',y=>'Real');

ANS(Formula(($a+$b*x**2+$e*x**3)*($f*x-12*(x+1)))->cmp);

ENDDOCUMENT()

### Warning messages (note that line numbers no longer

correspond since I have edited out some irrelevant text The line nmber isreferred to is the answer line.

`Operator or semicolon missing before *x at line 43 of (eval 154932)`

`Ambiguous use of * resolved as operator * at line 43 of (eval 154932)`

`Operator or semicolon missing before *x at line 43 of (eval 154932)`

`Ambiguous use of * resolved as operator * at line 43 of (eval 154932)`

`Operator or semicolon missing before *x at line 43 of (eval 154932)`

`Ambiguous use of * resolved as operator * at line 43 of (eval 154932)`