ini caranya gimana ya?

f:x --> 3x - 5 maka f(x) = 3x - 5
Df = {-3, -2, -1, 0, 1, 2}
maka
f(-3) = 3.(-3) - 5 = -14
f(-2) = 3.(-2) - 5 = -11
f(-1) = 3.(-1) - 5 = -8
f(0) = 3.0 - 5 = -5
f(1) = 3.1 - 5 = -2
f(2) = 3.2 - 5 = 1

Sehingga daerah hasilnya {-14, -11, -8, -5, -2, 1}