What is the minimum value of the function $y = 3 + \log _ { 3 } \left( x ^ { 2 } - 4 x + 31 \right)$? [3 points] (1) 4 (2) 5 (3) 6 (4) 7 (5) 8
What is the minimum value of the function $y = 3 + \log _ { 3 } \left( x ^ { 2 } - 4 x + 31 \right)$? [3 points]\\
(1) 4\\
(2) 5\\
(3) 6\\
(4) 7\\
(5) 8