A function is a paired set with elements in the domain and elements in the target space. Note we are only going to apply numbers in the domain set
f(-4) = 2(-4) - 1 = -8 - 1 =-9
f(-2) = 2(-2) - 1 = -4 - 1 =-5
f(0) = 2 (0) - 1 = 0 -1 = -1
f(2) = 2(2) -1 = 4-1 = 3
f(4) = 2(4) -1 = 8 -1 = 7
So the function set is {(-4,-9), (-2,-5), (0,-1), (2,3), (4,7)}
The curly bracket shows what is in the set and each pair has the domain (input) number first and the target (output) number second. We don't usually write out the sets for an infinite or continuous domain because that's too much work.
Alia H.
Thank you so much. I've been thinking about that for so long that I got a headache. It helped so much.11/04/22