Saab 900, an automobile from Saab, was released in 1978. It was based on the Saab 99[?] chassis, but longer. In 1994 a new generation based on an Opel chassis was introduced (altough the cabriolet was still made on the old chassis). Production ended in 1998.
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The formula and its proof remain correct if the coefficients a, b and c are complex numbers, or more generally members of any field ...