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x2 - y2 + 9x - 9y =

(x2 + 9x) - (y2 + 9y) =

x(x + 9) - y(y + 9)

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Another way to go after it:

x2 - y2 + 9x - 9y =

(x2 - y2) + 9x - 9y =

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

(x + y + 9) (x - y)

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Wiki User

15y ago

What else can I help you with?