# Category:PGML Answers

### Answer Checking in PGML

Answer blanks in PGML are indicated by `[___________]`

where the number of underscores determines the width of the answer blank on screen. Usually, the answer is tied to the blank by enclosing it in braces following the answer blank. (If not, you will need to use `ANS()`

outside the PGML code to provide an answer checker for the blank.) For example:

$f = Formula("sin(x)+x^2"); $Df = $f->D; BEGIN_PGML If [:f(x) = [$f]:], then [:f'(x) = :] [______________________]{$Df} END_PGML

produces a problem that displays a formula and asks for its derivative.

The answer you provide can be given in a variety of formats. It can be a number or a variable containing a number, a string that represents a MathObject to be used as the answer or a variable holding a MathObject, or a number of other possible values. These are described below.

### References

- Numeric Answers
- Formula Answers
- Answers from Variables
- MathObject Answers
- Traditional Answer Checkers
- External Answer Checkers
- Answers in Option Form

## Pages in category "PGML Answers"

The following 6 pages are in this category, out of 6 total.