The greatest common factor of the terms 2x3y2, -4x2y3 and 8xy4 of the expression 2x3y2 - 4x2y3+ 8xy4y64 is 2xy2.
Now,
2x3y2 = 2xy2 x2
-4x2y3 = 2xy2 -2xy
8xy4​ = 2xy2 4y2
Hence, the expression 2x3y2 - 4x2y3 + 8xy4 ​can be factorised as 2xy2(x2 - 2xy + 4y2)​.