a: \(=x\left(x-8\right)\)
c: \(=\left(x-3-y\right)\left(x-3+y\right)\)
\(a,=x\left(x-8\right)\\ b,=x\left(x-y\right)-6\left(x-y\right)=\left(x-6\right)\left(x-y\right)\\ c,=\left(x-3\right)^2-y^2=\left(x-y-3\right)\left(x+y-3\right)\\ d,=\left(x+y\right)\left(x^2-xy+y^2\right)+2\left(x+y\right)=\left(x+y\right)\left(x^2-xy+y^2+2\right)\)
a)x(x-8)
b)(x2-xy)-(6x-6y)
x(x-y)-6(x-y)
(x-y)(x-6)
c)(x-3-y)(x-3+y)
d)(x+y)(x2-xy+y2+2)