\[\boxed{\mathbf{3}\mathbf{.}}\]
\[y = f(x);\ \ \lbrack - 4;4\rbrack.\]
\[\textbf{а)}\ 1)\ Точка\ минимума:x = - 2;\]
\[точка\ максимума:\ x = - 4.\]
\[2)\ Точка\ минимума:x = - 4;\]
\[точка\ максимума:\ x = 4.\]
\[\textbf{б)}\ 1) - 2;1;3;\]
\[2) - 1;1;2;3.\]
\[\textbf{в)}\ 1)\ \max_{\lbrack - 4;4\rbrack}{f(x)} = f( - 4) = 3;\]
\[\min_{\lbrack - 4;4\rbrack}{f(x)} = f( - 2) = - 3.\]
\[2)\ \max_{\lbrack - 4;4\rbrack}{f(x)} = f(4) = 4;\]
\[\min_{\lbrack - 4;4\rbrack}{f(x)} = f( - 4) = - 1.\]
\[\textbf{г)}\ 1)\ f( - 2) = - 3;\]
\[f(1) = 2;\]
\[f(3) = - 1.\]
\[2)\ f( - 1) = 3;\]
\[f(1) = 0;\]
\[f(2) = 1;\]
\[f(3) = 0.\]