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! 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 :)