mohon penjelasan nya

x --> { -2 , 0 , 2 , 4 } dan f(x) = 7 - 1/2 x
Tinggal substitusi x --> -2 , 0 , 2 dan 4 utk dpt daerah hasil

f(-2) = 7 - 1/2 (-2)
= 7+1 = 8

f(0) = 7 - 1/2 (0)
= 7

f(2) = 7 - 1/2 (2)
= 7-1 = 6

f(4) = 7 - 1/2 (4)
= 7-2 = 5

Daerah hasil = { 8 , 7 , 6 , 5 }