Ответ:
\[y = - x^{2} + 6x - 8\]
| \[x\] | \[0\] | \[1\] | \[2\] | \[3\] | \[4\] | \[5\] |
|---|---|---|---|---|---|---|
| \[y\] | \[- 8\] | \[- 3\] | \[0\] | \[1\] | \[0\] | \[- 3\] |

\[- x^{2} + 6x - 8 \geq 0\]
\[x \in \lbrack 2;4\rbrack.\]
\[y = - x^{2} + 6x - 8\]
| \[x\] | \[0\] | \[1\] | \[2\] | \[3\] | \[4\] | \[5\] |
|---|---|---|---|---|---|---|
| \[y\] | \[- 8\] | \[- 3\] | \[0\] | \[1\] | \[0\] | \[- 3\] |

\[- x^{2} + 6x - 8 \geq 0\]
\[x \in \lbrack 2;4\rbrack.\]