Find All Rational Zeros of the Polynomial $p ( x ) = x ^ { 6 } + 2 x ^ { 5 } - 7 x ^ { 4 } - 20 x ^ { 3 } - 12 x ^ { 2 }$

Essay

Find all rational zeros of the polynomial $p ( x ) = x ^ { 6 } + 2 x ^ { 5 } - 7 x ^ { 4 } - 20 x ^ { 3 } - 12 x ^ { 2 }$ .