I need your help with Pre-Calc!!!?

Question

Let f(x)=18x^9-387x^8+3361x^7
-14692x^6+17910x^5+
164911x^4 -852405x^3
+1052928x^2+1384948x
-1172528

Determine the number of complex zeros of f(x) in the region C (-infinity,-3)U(3,infinity). Justify your answer.

Answer 1

IA 9th order polynomial has 9 zeroes. Draw it as a function in Excel, and count the number of zeros on your graph. Subtract this from 9 to get the number of complex zeroes.