11. (9) Integers $a, b$ and $c$ are such that $a \cdot\left(1-\frac{\sqrt{7}}{2}\right)^{2}+b \cdot\left(1-\frac{\sqrt{7}}{2}\right)+c=5$. What is the minimum value of $|a+b+c|$ under this condition?
Answer: 2.

Solution: If $a=0$, then $b=0$ and $c=5$, hence $|a+b+c|=5$. If $a \neq 0$, then consider the quadratic function $f(x)=a x^{2}+b x+c$. Notice that $f(x)-5$ has roots $1 \pm \frac{\sqrt{7}}{2}$. Therefore, $f(x)=$ $5+k \cdot\left(4 x^{2}-8 x-3\right), k \neq 0$, i.e., $|a+b+c|=|5-7 k|$, The minimum value of 2 is achieved when $k=1$.