\(\left\{{}\begin{matrix}a=2>0\\-\frac{b}{2a}=\frac{7}{4}\in\left[0;4\right]\end{matrix}\right.\)
\(\Rightarrow\min\limits_{\left[0;4\right]}f\left(x\right)=f\left(\frac{7}{4}\right)=6m-\frac{57}{8}\)
\(\Rightarrow6m-\frac{57}{8}< -\frac{9}{8}\)
\(\Rightarrow m< 1\)