What is the answer to x squared divided by 2?

You can't get an "answer" for this type of problem. It involves a variable number. The closest you can get is as follows:

x2/2

If we were to let x be equal to an integer we could calculate the following:

Let x = 2

22/2 = 4/2 = 2

Let x = 3

32/2 = 9/2 = 4.5

Let x = 4

42/2 = 16/2 = 8

Let x = 5

52/2 = 25/2 = 12.5