For the function $f ( x ) = x ^ { 3 } - 3 x + a$, when the local maximum value is 7, what is the value of the constant $a$? (1) 1 (2) 2 (3) 3 (4) 4 (5) 5
For the function $f ( x ) = x ^ { 3 } - 3 x + a$, when the local maximum value is 7, what is the value of the constant $a$?\\
(1) 1\\
(2) 2\\
(3) 3\\
(4) 4\\
(5) 5