A local maximum of the function f (x) occurs for which x-value?

-4

-3

-2

-1

My guess is - 1 because when a x value don't got a number replace it with a 1

I think the answer would be - 1 because normally you would place a 1 in front of x if it was negative, so I'm assuming you would do the same if it was - x and the one would just go after the negative symbol