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xに注目すると、x^2-(y^2-6y+9)となり、括弧内を因数分解すると、x^2-(y-3)^2となり、和と差の積になるので(？)、
x^2-y^2+6y-9=(x+y-3)(x-y-3)となります。
(途中言葉が変かもしれませんが…すみません^^;)
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わかりやすかったです
ありがとうございました(๑ ᴖ ᴑ ᴖ ๑)