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= 4x ( x - 1 ) 18 ( x - 1 )
= (4x + 18) (x-1)
18 = -2 . 9
jadi
(2x -2) (2x + 9) =
(2x . 2x ) (2x . 9) (-2 . 2x) (-2 . + 9)
4x² + 18x -4x -18
4x² +14x - 18