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Factor polynomial z^2+9

An expression to simplify:

The solution

You have entered [src]
 2    
z  + 9
z2+9z^{2} + 9
z^2 + 9
Factorization [src]
(x + 3*I)*(x - 3*I)
(x3i)(x+3i)\left(x - 3 i\right) \left(x + 3 i\right)
(x + 3*i)*(x - 3*i)
Numerical answer [src]
9.0 + z^2
9.0 + z^2