Find the zeros of the function f(z)=z2+8z+15f(z) = z^2 + 8z + 15f(z)=z2+8z+15.
z=3,5z = 3, 5z=3,5
z=−3,−5z = -3, -5z=−3,−5
z=8,15z = 8, 15z=8,15
z=−8,15z = -8, 15z=−8,15