1. The problem statement, all variables and given/known data Suppose f(z) = z^3 -27z + 15 Find R such that |f(z)|>|z| whenever |z|>R. 2. Relevant equations 3. The attempt at a solution Let f(z)=z, then I have z^3 -28z + 15 = 0 then, z=5, (-5+√(17))/2, (-5-√(17))/2. since 5 is the most further point, R=5. check my solution if it is right. I did it, but im not so sure.