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b.(x-6)(x+2)
x² + x + 2x + 2 = 0
x (x+1) +2 ( x+1) =0
( x+2) (x+1)=0
b)x² - 4x -12 = 0
x² + 2x - 6 x -12 = 0
x(x+2) -6(x+2)=0
(x-6) (x+2)=0
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