## WeBWorK Problems

### Negative numbers inside a radical in Complex context

by Alex Jordan -
Number of replies: 1
Does anyone know if there is a way to modify the Complex context so that a student could not get away with sqrt(-2) when I want them to enter sqrt(2)i?

The default counts either of these as correct solutions to say, x^2=-2.

### Re: Negative numbers inside a radical in Complex context

by Davide Cervone -

There is a flag that can be set to prevent that:

    Context("Complex");
Context()->functions->set(
sqrt => {negativeIsComplex => 0},
);


There is a similar flag for log. You may also want to do

    \$context->operators->set(
'^'  => {negativeIsComplex => 0},
'**' => {negativeIsComplex => 0},
);


so that you can't use (-2)^.5 either.