Question 1034570
x^2+25 is not a difference of squares because it's really a sum of squares.


a^2-36 is a difference of squares. We are subtracting a^2 and 6^2 which are both squares.


n^2-50 is not a difference of squares. n^2 is a square but 50 is not since no whole number squared is equal to 50.


w^2-121  is a difference of squares. We are subtracting w^2 and 11^2 which are both squares.


-----------------------------------------------


Answer: a^2-36 and w^2-121 are differences of squares expressions. The other expressions are not differences of squares.