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Eighteen

Eighteen (18) is the natural number following seventeen and preceding nineteen.

Eighteen is a composite number, its proper divisors being 1, 2, 3, 6 and 9.

18 is the age limit for being allowed a driver's license in many parts of the world.

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Quadratic formula

... a single fraction; the common denominator is 4a2. We get <math>\left(x+\frac{b}{2a}\right)^2=\frac{-4ac+b^2}{4a^2}=\frac{b^2-4ac}{4a^2}.</math> Taking ...