\[y = 4x^{2} + 8x - 7 \Longrightarrow ветви\ \]
\[вверх.\]
\[x_{0} = \frac{- 8}{8} = - 1;\ \ y_{0} = - 11.\]
\[Убывает\ на\ ( - \infty; - 1\rbrack;\ \ \]
\[возрастает\ на\ \lbrack - 1; + \infty).\]
\[\lbrack - 3;4\rbrack:\]
\[y_{наим} = - 11.\]