If you are creating content in Schoology and prefer LaTeX to an equation editor, here's how you can do it.
I'll assume you already have created a course. Let's say you want to create a test. So, click Add Materials, and select Add Test/Quiz.
Let's create a multiple choice question:
Now, click the insert content dropdown menu, and select LaTeX:
Enter your LaTeX string:
You can do the same with your answers by selecting the rich text editor: