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\(x^2-y^2+4x+4\)
\(=\left(x+2\right)^2-y^2\)
\(=\left(x+2+y\right)\left(x+2-y\right)\)
\(4x^2-y^2+8\left(y-2\right)\)
\(=4x^2-\left(y^2-8y+16\right)\)
\(=4x^2-\left(y-4\right)^2\)
\(=\left(2x+y-4\right)\left(2x-y+4\right)\)
a, x^2 - x - y^2 - y
= (x^2 - y^2) - ( x+ y)
= ( x- y)(x+y) - ( x+y )
= ( x - y - 1 )(x+ y)
b, x^2+ 6x + 9 - y^2
= ( x+ 3)^2 - y^2
= ( x+ 3 -y)( x + 3 +y)
\(x^2+y^2-x^2y^2+xy-x-y\)
\(=x^2-x^2y^2+y^2-y+xy-x\)
\(=x^2\left(1-y^2\right)+y\left(y-1\right)+x\left(y-1\right)\)
\(=x^2\left(1-y\right)\left(y+1\right)+y\left(y-1\right)+x\left(y-1\right)\)
\(=\left(y-1\right)\left[-x^2\left(y+1\right)+y-x\right]\)
\(=\left(y-1\right)\left[-x^2y-x^2+y-x\right]\)
\(A=x\left(y^2-z^2\right)+y\left(z^2-x^2\right)+z\left(x^2-y^2\right)\)
\(=x\left(y-z\right)\left(y+z\right)+yz^2-yx^2+zx^2-zy^2\)
\(=\left(y-z\right)\left[x.\left(y+z\right)\right]-x^2\left(y-z\right)-yz\left(y-z\right)\)
\(=\left(y-z\right)\left(xy+xz\right)-x^2\left(y-z\right)-yz\left(y-z\right)\)
\(=\left(y-z\right)\left(xy+xz-x^2-yz\right)\)
\(=\left(y-z\right)\left[\left(xy-x^2\right)+\left(xz-yz\right)\right]\)
\(=\left(y-z\right)\left[x\left(y-x\right)-z\left(y-x\right)\right]\)
\(=\left(y-z\right)\left(y-x\right)\left(x-z\right)\)
\(x^2+y^2-x^2y^2+xy-x-y.\)
\(=\left(x^2-x^2y^2\right)+\left(y^2-y\right)+\left(xy-x\right)\)
\(=x^2\left(1-y^2\right)+y\left(y-1\right)+x\left(y-1\right)\)
\(=x^2\left(1-y\right)\left(1+y\right)-y\left(1-y\right)-x\left(1-y\right)\)
\(=\left(1-y\right)\left(x^2\left(1+y\right)-y-x\right)\)
\(=\left(1-y\right)\left(x^2+x^2y-y-x\right)\)
\(=\left(1-y\right)\left[\left(x^2-x\right)+\left(x^2y-y\right)\right]\)
\(=\left(1-y\right)\left[x\left(x-1\right)+y\left(x^2-1\right)\right]\)
\(=\left(1-y\right)\left[x\left(x-1\right)+y\left(x-1\right)\left(x+1\right)\right]\)
\(=\left(1-y\right)\left[\left(x-1\right)\left(x+y\left(x-1\right)\right)\right]\)
\(=\left(1-y\right)\left(x-1\right)\left(x+yx+y\right)\)
=(x2-y2)-(x+y)
=(x-y)(x+y)-(x+y)
=(x+y)[(x-y)-1]
=(x+y)(x-y-1)