Clear Parentheses and Combine Like Terms $$- 2 t ^ { 2 } + 6 t - 13 t ^ { 2 } - 21 t + 12$$

Short Answer

Clear parentheses and combine like terms. $$- 2 t ^ { 2 } + 6 t - 13 t ^ { 2 } - 21 t + 12$$