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Factor polynomial x^2+4

An expression to simplify:

The solution

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