We need draw the structure of (3E,5E)-2,5-dibromo-3,5-octadiene.
The structure is shown below:
The molecule has two double bonds in 3 and 5 position and two Br-atoms attached to 2 and 5 position.
The configuration is 3E and 5E. E configuration indicates cis- isomers where similar groups are in same side with respect to double bonds.
