Find All Rational, Irrational, and Complex Zeros (And State Their $P ( x ) = x ^ { 4 } + 10 x ^ { 2 } - 2 x ^ { 3 } - 18 x + 9$

Essay

Find all rational, irrational, and complex zeros (and state their multiplicities). $P ( x ) = x ^ { 4 } + 10 x ^ { 2 } - 2 x ^ { 3 } - 18 x + 9$