You are asked to find \(\displaystyle a-b+c\). For what value of \(\displaystyle x\) will \(\displaystyle y = a-b+c\)? You want the coefficient of \(\displaystyle b\) to be \(\displaystyle -1\), so try \(\displaystyle x = -1\). Plugging that in, you get \(\displaystyle y = a(-1)^2 + b(-1) + c = a-b+c\). So, looking at the graph, what is the value for \(\displaystyle y\) when \(\displaystyle x = -1\)? That will be your answer.