SOLUTION: Factor the polynomial completely. {{{x^2-y^2+18y-81}}}

Question 45878: Factor the polynomial completely.

Answer by Earlsdon(6294) (Show Source): You can put this solution on YOUR website!
I provided a solution (# 29893) for this problem previously.
Factor completely:
Group the last four terms.
Note the change in sign due to the introduction of the parentheses. Now factor the parentheses. =
You will notice that you now have the difference of two squares which will factor nicely.
This can be simplified to:
These are the required factors.

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