Find All Complex Zeros of the Polynomial Function $$f ( x ) = x ^ { 3 } + 8 x ^ { 2 } - 18 x + 20$$

Multiple Choice

Find all complex zeros of the polynomial function. Give exact values. List multiple zeros as necessary.
- $$f ( x ) = x ^ { 3 } + 8 x ^ { 2 } - 18 x + 20$$

A) $1 + i , 1 - i , - 10$
B) $1 + i , - 10,10$
C) $1 + i , 1 - i , 10$
D) $1 + \mathrm { i } , 1 - \mathrm { i } , 10 \mathrm { i }$