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f(-2) = (-2)² - 4 = 4 - 4 = 0
f(-1) = (-1)² -4 = 1-4 = -3
f(4) = 4² - 4 = 16 - 4 = 12
f(6) = 6² - 4 = 36-4 = 32
zw ∈ {-3, 0, 5, 12 ,32}
b) f(-2) = -2 + 9 = 7
f(-1) = -1+9 = 8
zw ∈ <7, +∞)