Factor by grouping.
x2y - xyb - abx + ab2
The first two can factor out an xy, so xy(x - b)
The second two can factor out a -ab, so -ab(x - b) and we have
xy(x - b) - ab(x - b)
Since what is inside the parentheses is alike, we can be assured that we have factored correctly and now continue to group:
ANS: (x - b)(xy - ab)
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