Hallo,
$$ \begin{array}{cccc} & - \frac 3 7 (x+ \frac 1 3)(x+ \frac 23) \\ \Rightarrow & -\frac 37 (x^2 + x + \frac 2 9) \\ \Rightarrow & - \frac 3 7 (x^2 + x + (\frac 1 2)^2 - (\frac 1 2)^2 + \frac 2 9) \\ \Rightarrow & - \frac 3 7 ((x+\frac 1 2)^2 - \frac 1 4 + \frac 2 9 ) \\ \Rightarrow & - \frac 3 7 ((x+\frac 1 2)^2 - \frac 1 {36} ) \\ \Rightarrow & - \frac 3 7 (x+\frac 1 2)^2 + \frac 1 {84} \end{array}$$
Grüße Christian
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