Math explanation?
Below is the step circled in blue. Why do you have to multiply x(-1)? Why is the equation changed instead of left as it is?
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deswegen
erst muss +1x² = x² dastehen ,dann ist pq möglich
Weil für die pq-Formel vor dem x² der Faktor 1 stehen muss
und nicht -1.
Du siehst ja, dass sich die Vorzeichen von allen Summanden
umgekehrt haben.