\[f(x) = 11x^{2} - 3x \Longrightarrow ветви\ \]
\[вверх.\]
\[x_{0} = \frac{3}{22},\ \ \]
\[y_{0} = \frac{9}{44} - \frac{9}{22} = - \frac{9}{44}.\]
\[E(f) = \left\lbrack - \frac{9}{44}; + \infty \right),\ \ \]
\[убывает\ на\ \left( - \infty;\frac{3}{22} \right\rbrack;\ \ \]
\[возрастает\ на\ \left\lbrack \frac{3}{22}; + \infty \right).\]