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3x² + 9x - 4x - 12 = 0
(3x² + 9x) + (-4x - 12)=0
3x (x + 3) - 4(x+3)=0
(3x - 4) ( x + 3)= 0
3x-4=0 v x+3=0
3x=4 x=-3
x= 3/4
5 = 9 - 4
3x(pangkat2) + 9x + 4x + 12
3x ( x + 3 ) 4 ( x + 3 )