Jostein Gaarder (August 8, 1952 - ) is a Norwegian author. His best known work is the novel Sophie's World[?] (ISBN 0425152251, original title Sofies verden).
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... we get <math>x=\frac{-b}{2a}\pm\frac{\sqrt{b^2-4ac}}{2a}=\frac{-b\pm\sqrt{b^2-4ac}}{2a}.</math> Generalizations The formula and its proof remain ...