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WIe bekomme ich die Hochzahl x2 weg?

nach X auflösen

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x+4=x2-8x+15

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WIe bekomme ich die Hochzahl x2 weg?   

bei    

x+4=x2-8x+15      ???


0  =x2-9x+11    dann mit pq-Formel

x = 9/2  ± √37 / 2


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