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f(2)=4(2)-4=4
f(4)=4(4)-4=12
f(6)=4(6)-4=20
f(2) = 4(2)-4 = 4
f(4) = 4(4)-4 = 12
f(6) = 4(6)-4 = 20
(0,-4),(2,4),(4,12),(6,20)