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\(x^2+4xy-4z^2+4y^2\)
\(=x^2+4xy+4y^2-4z^2\)
\(=\left(x+2y\right)^2-4z^2\)
\(=\left(x+2y-2z\right)\left(x+2y+2z\right)\)
\(x^2+2x-15\)
\(=x^2+2x+1-16\)
\(=\left(x+1\right)^2-16\)
\(=\left(x+1-4\right)\left(x+1+4\right)\)
\(=\left(x-3\right)\left(x+5\right)\)
\(=\left(x+2y\right)^2-4z^2=\left(x+2y+2z\right)\left(x+2y-2z\right)\)
\(x^2+4xy-9+4y^2\)
\(=\left(x^2+4xy+4y^2\right)-9\)
\(=\left(x+2y\right)^2-3^2\)
\(=\left(x+2y+3\right)\left(x+2y-3\right)\)
\(=\left(x+2y\right)^2-9=\left(x+2y-3\right)\left(x+2y+3\right)\)
\(2x^2-4xy+2y^2\\ =2\left(x^2-2xy+y^2\right)\\ =2\left(x-y\right)^2\)
a) 2x2-4xy+2y2
= 2x2-2xy-2xy+2y2
= 2x(x-y)-2y(x-y)
= (2x-2y)(x-y)
b) x2+4xy+4y2-9
= (x+2y)2-32
= (x+2y-3)(x+2y+3)
c) x4-x3y+x-y
= x3(x-y)+(x-y)
= (x3+1)(x-y)
= x^2+4xy+4y^2 -4z^2
= (x+2y)^2 -4z^2
=(x+2y-2z)(x+2y+2z)
\(=\left(x+2y-2z\right)\left(x+2y+2z\right)\)