Question

x² + 4x - y² + 4

 

Answer 1

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

Answer 2

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

Answer 3

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

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

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