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Beweis

=0.4pt $-p \pm \sqrt{p^2-4q} = -2p$ $\Rightarrow$ $-2p=-2p$

$\left(-p+\sqrt{p^2-4q}\right)\cdot{}\left(-p-\sqrt{p^2-4q}\right)=4q$ $\Rightarrow$ $4q=4q$

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