a: =x(2x-y)-4(2x-y)
=(2x-y)(x-4)
i: =3(2x-y)+(2x-y)^2
=(2x-y)(2x-y+3)
e: =(3x-y)(3x+y)-(3x-y)
=(3x-y)(3x+y-1)
g: =(5-2x)(25+10x+4x^2)+xy(5-2x)
=(5-2x)(25+10x+4x^2+xy)
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