Factorization: 9A & # 178; (X-Y) + 4B & # 178; (Y-X) and (x + y) &# 178; + 2 (x + y) + 1, let's talk about the process

9A & # 178; (X-Y) + 4B & # 178; (Y-X) = 9A & # 178; (X-Y) - 4B & # 178; (X-Y) = (X-Y) (9a & # 178; - 4B & # 178;) = (x + y) (3a + 2b) (x + y) &# 178; + 2 (x + y) + 1, which directly uses the complete sum of squares formula to treat (x + y) as a whole! = [(x + y) + 1] &# 178; = (x + y + 1) &# 178; = (x + y + 1) &#

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