Factor the four-term polynomial by grouping. xy + 11x - 9y - 99

Factor the four-term polynomial by grouping.

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x(y+11)-9(y+11)=(x-9)(y+11)

You can see this better if you let z=y+11, then it becomes xz-9z which factorises: (x-9)z.

Replacing z we get (x-9)(y+11)
by Top Rated User (1.2m points)

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