This is a simple calculator which can be used to solve:
quadratic equation- (remember the x^2 stuff) all you have to do is enter the coefficients!
Now it also does imaginary roots! This calculator is very useful to check your Homework
Pythagorean theorem- (remember the 3 sides of a right triangle) all you have to do is enter 2 sides of a triangle, and it will tell you the third side.
Area/Volume of Basic shapes- you can select basic shapes and enter values and you will the the area or the volume.
It can be great for checking work or avoiding tedious work :)