Question

4-x²+4xy-4y²

Answer 1

\(4-x^2+4xy-4y^2\)

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

\(=2^2-\left(x-2y\right)^2\)

\(=\left(2-x+2y\right)\left(2+x-2y\right)\)

Answer 2

\(4-x^2+4xy-4y^2\)

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

\(=2^2-\left(x-2y\right)^2\)

\(=\left(2+x-2y\right)\left(2-x+2y\right)\)