Simplify √-48. A) -4√3
B) 4√-3
C) 4i√3
D) 4√3i

I feel like its either C or D but I'm not sure pls help <3

The graph of a function f(x)=(x+2)(x-4). which describes all of the values for which the graph is negative and increasing? all real values of x where x< -2 all real values of x where -2