An expression involves subtracting two numbers from a positive number. under what circumstances with the value expression be negative? give an example

So (positive integer)-x-y can be negative
so to get a negative number as your result/answer, x+y must be greater than (positve integer) so  for example

lets say (positive integer)=8
x+y must be greater than 8 to make the equation negative so
example
x=5
y=4
x+y=9
8-9=-1

You must find the surface of the block therefore 98187 dived by 5628 = 583m squared