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Supersonic

Any speed over the speed of sound is said to be supersonic. Many modern fighter aircraft are supersonic. The Concorde is a supersonic passenger aircraft, currently the only one flying. Speeds greater than 5 times the speed of sound are sometimes referred to as hypersonic.

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Quadratic formula

... 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 square roots of both ...