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

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

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

$2 H_{2} (g) + O_{2} (g) ⇌ 2 H_{2} O (l)$

The entire formula for the surface area of a cylinder is $2 {πr}^{2} + 2 πrh$