​ Enter the number of complex zeros for the polynomial function in the box.

Not as tricky as it seems....!!!

Note we can factor this as

x ( x^4   + 4x^2  - 5 )  

And the second polynomial can be factored as

x (x^2 + 5) (x^2 - 1)   =   

And we can continue

x ( x^2 + 5) (x + 1) ( x - 1)

We have thre real roots   x = 0, x = -1 and x  = 1

The  "x^2 + 5"  will produce two  complex roots

So.....2  is the number of complex roots (zeroes)