If [[x]] = x^2 + 2x + 4, what is the value of [[7]]? Choose the correct option:
A) 3 B) 9 C) 15 D) 67 E) 25
These functions questions might look intimidating, but they just test your knowledge about how well you can substitute values   [[x]] = x^2 + 2x + 4   [[7]] = 7^2 + 2*7 + 4 = 67. Option 67
<result>D</result>
If [[x]] = x^2 + 2x + 4, what is the value of [[7]]?