re
D = x² - 4 x + 4 - 4 x² - 8 x
= - 3 x² - 12 x + 4
D = ( ( x - 2 ) ( x - 2 - 4 x )
= ( x - 2 ) ( - 3 x - 2 )
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re
D = x² - 4 x + 4 - 4 x² - 8 x
= - 3 x² - 12 x + 4
D = ( ( x - 2 ) ( x - 2 - 4 x )
= ( x - 2 ) ( - 3 x - 2 )