The Powers of X In $2 x ^ { 4 } + 3 x ^ { 3 } + 5 x ^ { 2 } - 6 x - 7$

The powers of x in $2 x ^ { 4 } + 3 x ^ { 3 } + 5 x ^ { 2 } - 6 x - 7$ are written in __________ order.