# Formula Answers - PGML

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## Formula Answer Checkers

To use a formula as an answer, put the formula in quotation marks inside braces after the answer blank:

BEGIN_PGML The square root of [:x:] is written [__________]{"sqrt(x)"} END_PGML

Note that the quotation marks are *required*, so don't forget them.

The formula can be stored in a variable:

$a = 3; $b = 5; $answer = "$a + $b x"; BEGIN_PGML The formula is [______]{$answer} END_PGML

The formula can be a MathObject Formula as well

$a = 3; $b = 5; $answer = Compute("$a + $b x"); BEGIN_PGML The formula is [______]{$answer} END_PGML

See the section on MathObject Answers for details on how to provide additional control over the MathObject answer checkers.