$$\text { Find the points on the curve } y = 2 x ^ { 3 } + 3 x ^ { 2 } - 36 x + 19 \text { where the tangent is horizontal. }$$

$$\text { Find the points on the curve } y = 2 x ^ { 3 } + 3 x ^ { 2 } - 36 x + 19 \text { where the tangent is horizontal. }$$