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= f ( 2x - 1 )
= (2x - 1)² - 5
= 4x² - 4x + 1 - 5
= 4x² - 4x - 4 ===> bisa sama-sama dibagi 4 atau 2
sama-sama dibagi 2, hasil nya
2x² - 2x - 2
atau sama-sama dibagi 4, hasil nya
x² - x