Determine the range of the function f(n)=3n2+6f(n) = 3n^2 + 6f(n)=3n2+6.
(−∞,∞)(-\infty, \infty)(−∞,∞)
[0,∞)[0, \infty)[0,∞)
[6,∞)[6, \infty)[6,∞)
[3,∞)[3, \infty)[3,∞)