Question

x² -4xy +4y² -36z²

Answer 1

\(=\left(x-2y\right)^2-\left(6z\right)^2=\left(x-2y-6z\right)\left(x-2y+6z\right)\)

Answer 2

\(x^2-4xy+4y^2-36z^2=\left(x-2y\right)^2-6^2z^2=\left(x-2y-6z\right)\left(x-2y+6z\right)\)

Answer 3

`x^2 -4xy +4y^2 -36z^2`

`=x^2 - 2.x.2y + (2y)^2 - (6z)^2`

`=(x-2y)^2 - (6z)^2`

`=(x-2y+6z)*(x-2y-6z)`