Central Criminal Court (http://www.cityoflondon.gov.uk/leisure_heritage/architectural_heritage/criminal_court.htm) from the architectural heritage section of the City of London website
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... the equation. The formula reads
<math>
x=\frac{-b \pm \sqrt {b^2-4ac}}{2a}
</math>
The term b2 – 4ac is called the discriminant of the quadratic ...