Find the product: `(x+y+2z)(x^2+y^2+4z^2-x y-2y z-2z x)`

Find the following products: (i) (x+y+2z)(x^2+y^2+4z^2-x y-2y z-2x z) (ii) (2x-y+3z)(4x^2+y^2+9z^2+2x y+3y z-6x z)

Find the product: (2x-y+3z)(4x^2+y^2+9z^2+2x y+3y z-6x z)

Find the product: (2x-y+3z)(4x^2+y^2+9z^2+2x y+3y z-6x z)

Find the product: (4x-3y+2z)\ (16 x^2+9y^2+4z^2+12 x y+6y z-8z x)

Find the product: (3x+2y+2z)\ \ (9x^2+4y^2+\ 4\ z^2-\ 6\ x y-4\ y z-6z x)

Find the product: (3x-4y+5z)\ (9x^2+16 y^2+25 z^2+12 x y-15 z x+20 y z)

Find the value of 4x^2+y^2+25 z^2+4x y-10 y z-20 z x when x=4,y=3 and z=2.

Find the value of 4x^2+y^2+25 z^2+4x y-10 y z-20 z x when x=4,\ y=3 and z=2