
#1
Jul109, 05:13 PM

P: 4

1. The problem statement, all variables and given/known data
Find the limit of a complex number involving infinity. 2. Relevant equations Lim z>infiity of (8z^3+5z+2) 3. The attempt at a solution I tried to split the problem into real and imaginary parts using z = x+iy, but I don't know how to deal with the z>infinity. Thanks! 



#2
Jul109, 08:04 PM

P: 676

I could be misreading the problem, but the real part and imaginary part of that equation will go to infinity as well no matter which you take.




#3
Jul109, 08:37 PM

Sci Advisor
HW Helper
Thanks
P: 25,175

z>infinity means z>infinity. What can you say about lim 8z^3+5z+2?




#4
Jul209, 05:37 AM

Math
Emeritus
Sci Advisor
Thanks
PF Gold
P: 38,900

Infinite Limit Complex Function
Thanks, Dick. I was about to ask exactly what "z> infinity" meant! In the complex plane there can be an infinite number of "infinities"!



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