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3x( x - 3 ) -4x^2(3 -x )=3x( x - 3 )+4x^2(x-3 )=(x-3)(3x+4x^2)=x(x-3)(3+4x)
b)
2xy(2 - y ) -4x(y - 2)=2xy(2 - y )+4x( 2-y) =(2 - y )(2xy+4x) =2x(2 - y )(y+2)