# Questions API – Formula question type

One of the many question types provided by the Learnosity **Questions API**. The formula question type allows for easy input of complex math or scientific expressions, with powerful validation capabilities for authors.

Input is captured in the popular LaTeX format. Try entering some maths below to see the resulting LaTeX output.

## Demos

1. Basic question

2. Validation: enter any mathematical expression equivalent to **x** and check your answer.
e.g. **2x - x**

3. Response positions: enter the symbol to complete the quadratic equation.

4. Custom toolbar buttons

5. Formula essay question type. Each line of input is either math or text.