Does a front wheel drive car need back wheel alignment?

Answer 1

If it is out of specification the rear, yes. If it is in specification, no. Makes sense, doesn't it!

Some cars have adjustable alignment angles in the rear, and do indeed call for a four-wheel alignment. On many cars, there are no rear adjustments, but the front wheels should be aligned with respect to the rear, what is properly called a thrust-angle alignment. Unfortunately, many shops are not careful with their terminology and use the term "four-wheel alignment" when they really mean "thrust-angle alignment." Even so, they usually correctly distinguish between cars that have alignable rear ends and those that don't, and price the job accordingly.

As to whether your car has an alignable rear end, you'll need to refer to a shop manual to find out.