You can use LaTeX notation and the Beautiful Math component of Jetpack to include complex mathematical and scientific expressions in your quizzes.
Once you have installed Jetpack and activated the Beautiful Math module, you can enter any LaTeX code in your questions/answers, with ‘$latex’ before it and ‘$’ after it (as described here), and it will be converted to an image for display in your quizzes.
What the course author enters:
What the learner sees: