2xy
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The difference of cubes has a formula. (4x - y)(16x2 + 4xy + y2)
Remove common factors. The common factor is 3x. Then since you must keep the expression constant you put in parentheses what you must multiply 3x by to get each of the original parts of the expression. So the answer must be 3x+3xy=3x(1+y).
3x2y - 4xy + 4x
x(y-10)+6(y-10) ^^^that's the first step, then: the x and 6 pair together, and one of the (y-10) leaves the expression so it becomes: (x+6)(y-10) this is referred to as Factoring by Grouping