\[y = 3\sqrt{2x - 4} + 4x - 2\]
\[2x - 4 \geq 0\]
\[2x \geq 4\]
\[x \geq 2.\]
\[D(y) = \lbrack 2; + \infty)\text{.\ }\]
\[y(2) = 3\sqrt{2 \cdot 2 - 4} + 4 \cdot 2 - 2 = 6.\]
\[E(y) = \lbrack 6; + \infty).\]