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We know that the absolute value of X-Y + 1 and XX + 8x + 16 are opposite to each other in the factorization of the second grade mathematics, and we can find the value of XX + 2XY + YY

We know that the absolute value of X-Y + 1 and XX + 8x + 16 are opposite to each other in the factorization of the second grade mathematics, and we can find the value of XX + 2XY + YY

xx+8x+16=(x+4)^2>=0
The absolute value of X-Y + 1 > = 0
So XX + 8x + 16 = (x + 4) ^ 2 = 0
x=-4
y=-3
xx+2xy+yy=49

How to factorize 12a (XX + YY) - 18B (XX + YY)

（12a-18b）（xx+yy）
=6（2a-3b）（xx+yy）

Factorization of xx-yy-x-y

xx-yy-x-y =(x^2-y^2)-(x+y)=(x+y)(x-y)-(x+y)=(x+y)(x-y-1)