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= x kuadrat + 2x - 4
= 2x - 4
= 2 ( x kuadrat + 2x - 4) - 4
= 2xkuadrat + 4x - 8 - 4
= 2xkuadrat + 4x - 12
(fog)(3) = 2(3)² + 4(3) - 12
= 18 + 12 - 12
= 18