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b) bayangan (daerah hasil) dari 2, -2, 4, dan -4 :
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, bayangan (daerah hasil) dari 2, -2, 4, dan -4 adalah {6, -10, 14, -18}
c) Jika 8 adalah bayangan dari p, berarti:
f(p) = 8
f(p) = 4p - 2
8 = 4p - 2
4p = 8 + 2
4p = 10
p = 10 : 4
p = 2,5