William W. answered • 10/29/20

Math and science made easy - learn from a retired engineer

25 divided by 2 is 25/2 (or 12.5). Squaring 25/2 gives us 25^{2}/2^{2} = 625/4 (or 156.25)

This results in the square which is written as (z + 25/2)^{2} or, if you want to use decimals, (z + 12.5)^{2}