## Encyclopedia > 1975

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# 1975

Years: 1970 1971 1972 1973 1974 - 1975 - 1976 1977 1978 1979 1980

Events

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Births

Deaths

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 Quadratic formula ... the roots of the equation. The formula reads $x=\frac{-b \pm \sqrt {b^2-4ac}}{2a}$ The term b2 – 4ac is called the discriminant of ...