David L. answered 05/29/20
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It would help if you used the available formatting symbols.
(x-y)(x-2y)
= x(x-y) - 2y(x-y)
= x2 - xy - 2yx + 2y2
= x2 - 3xy + 2y2,
so the first blank is 3, and the second one is 2.