Find the Sum, Difference, or Product $2 ( 2 - 5 t ) - t ^ { 2 } ( t - 2 ) + \left( t ^ { 4 } - 1 \right)$

Find the sum, difference, or product. $2 ( 2 - 5 t ) - t ^ { 2 } ( t - 2 ) + \left( t ^ { 4 } - 1 \right)$