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b. f(x) = 4x -2
f(2) = 4(2) -2
= 8 -2
= 6
f(-2) = 4(-2) -2
= -8 -2
= -10
f(4) = 4(4) -2
= 16 -2
= 14
f(-4) = 4(-4) -2
= -16 -2
= -18
Jadi, daerah hasil = {6, -10, 14, -18}
c. f(x) = 4x -2
f(p) = 4(p) -2 = 8
= 4p -2 = 8
= 4p = 8 +2
= 4p = 10
= p = 10 / 4
= p = 2,5
Jadi, nilai p = 2,5