In elementary algebra, the **quadratic formula** is the solution of the quadratic equation.

$x=\frac{-b\pm \sqrt{{b}^{2}-4ac}}{2a}$

**Water is made from two elements** - Hydrogen and Oxygen. If you put the two gases together, along with energy, you can make water.

$2{\mathrm{H}}_{2}\left(\mathrm{g}\right)+{\mathrm{O}}_{2}\left(\mathrm{g}\right)\rightleftharpoons 2{\mathrm{H}}_{2}\mathrm{O}\left(\mathrm{l}\right)$

The entire formula for the surface area of a cylinder is $2{\mathrm{\pi r}}^{2}+2\mathrm{\pi rh}$