Hi,

18z + 45 + z^2   \Note use of ^  (uppercase 6)

If You meant:

f(z) =    and to find where f(z) = 0

 = 0

Quadratic formula ALWAYS works









     z = -3  and z = -15

OR by factoring:

 = 0

  (z + 3)(z+15) = 0   

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