Question

21xy,7x^(3)y
what's the question here?

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Factor by Grouping.Thanks Bob. PLEASE SHOW ME THE STEPS! 1.) 6x2-21xy+8xz-28yz just to make it c... Solve for x and y: x+4y=27xy and x-2y=21xy. 2. Solve for x and y: x^2018*y^2017 =1/2 and x^2016*y... Solve: x+4y=27xy x-2y=21xy.pls i need answer urgently.