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Factor polynomial -x^2+4

An expression to simplify:

The solution

You have entered [src]
   2    
- x  + 4
$$4 - x^{2}$$
-x^2 + 4
Factorization [src]
(x + 2)*(x - 2)
$$\left(x - 2\right) \left(x + 2\right)$$
(x + 2)*(x - 2)
Numerical answer [src]
4.0 - x^2
4.0 - x^2
Combinatorics [src]
-(-2 + x)*(2 + x)
$$- \left(x - 2\right) \left(x + 2\right)$$
-(-2 + x)*(2 + x)