If [[x]] = x^2 + 2x + 4, what is the value of [[2]]?	Choose the correct choice from the following.
A) 3
B) 9
C) 12
D) 19
E) 25

Rationale: these functions questions might look intimidating , but they just test your knowledge about how well you can substitute values [ [ x ] ] = x ^ 2 + 2 x + 4 [ [ 2 ] ] = 2 ^ 2 + 2 * 2 + 4 = 12 . option c
Answer: C