Answer
$$(2+x)(2-x)$$
Work Step by Step
$4-x^{2}$
This is the difference between two squares.
There is a simple formula for this case:
$x^{2}-y^{2}=(x+y)(x-y)$
So, applying this formula,
We need to take the square of both terms.
$\sqrt 4=2$
$\sqrt x^{2}=x$
So the answer would look like:
$$(2+x)(2-x)$$
(One with a positive sign and one with a negative sign.)
