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uji titik-titik yang memenuhinya:
(-2,2) --> f(-2,2) = 4(-2) - 2(2) = - 12
(1,4) --> f(1,4) = 4(1) - 2(4) = - 4
(1,0) --> f(1,0) = 4(1) - 2(0) = 4
(3,0) --> f(3,0) = 4(3) - 2(0) = 12
Terlihat bahwa minimumnya adalah -12.