Write a method that accepts a number 'firstSquare' that will be the lower number to square. You will also consider the square of the next higher integer. Return the difference between the higher number squared and the lower number ('firstSquare') squared. For example, if 'firstSquare' is 4, you will return 9 because 4 squared is 16 and 5 squared is 25. 25-16=9. So the difference is 9. There are some SERIOUS restrictions on this problem! The ONLY data type you are allowed to use anywhere in your code is 'int'. You cannot use 'long' or 'real' or 'double'! You cannot use an array. Just 'int'. This is a SERIOUS restriction because some of the 'firstSquare' numbers will be greater than the maximum integer value if you square them. So, you must find a way to get solutions to a problem involving squares without actually finding those squares! As a precondition, you may assume that 'firstSquare' is non-negative. As always, look at the test data for examples.