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= ( x² - 2x ) - ( 1x + 2 )
= x ( x - 2 ) - 1 ( x - 2 )
= ( x - 1 ) ( x - 2 )
kalau sepertiitu =
d = b² - 4 ac
= 5² - 4 ( 1 ) ( 2 )
= 25 - 8
= 17cm