Answer :
You have the following piece function:
f(x) = -x-9 for x≠-4
-4 for x=-4
as you can notice in the previous piece function, there is a unique value of f(x) when x=-4, and such value is f(-4) = -4
You have the following piece function:
f(x) = -x-9 for x≠-4
-4 for x=-4
as you can notice in the previous piece function, there is a unique value of f(x) when x=-4, and such value is f(-4) = -4