The function is .

The complex zeros occur in conjugate pairs, you know that 52i is also a zero of f.

This means that both are factors of f.

Multiplying these two factors produces .

                       (Using the formula )

           (The imaginary unit )

Using long division, you can divide into f to obtain the .

So,

To find the all zeros of the function then f(x) = 0, .

The quadratic formula of .

Then conclude that the zeros of f are .

The solutions are .