\(11,=\left(x^2-2xy+y^2\right)+4\left(x-y\right)\\ =\left(x-y\right)^2-4\left(x-y\right)\\ =\left(x-y\right)\left(x-y-4\right)\\ 12,=3\left(a-b\right)-\left(a^2-2ab+b^2\right)\\ =3\left(a-b\right)-\left(a-b\right)^2\\ =\left(a-b\right)\left(3-a+b\right)\\ 13,=\left(9x^2+6xy+y^2\right)+5\left(3x+y\right)\\ =\left(3x+y\right)^2+5\left(3x+y\right)\\ =\left(3x+y\right)\left(3x+y+5\right)\\ 14,=-\left(4x^2+4xy+y^2\right)+7\left(2x+y\right)\\ =-\left(2x+y\right)^2+7\left(2x+y\right)\\ =\left(2x+y\right)\left(-2x-y+7\right)\)
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