5x^2-4y+xy-20x
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5x^2-4y+xy-20x5x^2-4y+xy-20x5x^2-4y+xy-20x5x^2-4y+xy-20x=5x^2-20x-4y+xy=5x(x-4)-y(4-x)=5x(x-4)+y(x-4
5x^2-4y+xy-20x
5x^2-4y+xy-20x
5x^2-4y+xy-20x
5x^2-4y+xy-20x
=5x^2-20x-4y+xy
=5x(x-4)-y(4-x)
=5x(x-4)+y(x-4)
=(x-4)(5x+y)