The expression $25x^2 - 16y^2$ represents a difference of squares. This is a special algebraic form that can be factored using the identity for the difference of squares:

$a^2 - b^2 = (a - b)(a + b)$

In this expression, we can identify:

• $a^2 = 25x^2$, so $a = 5x$
• $b^2 = 16y^2$, so $b = 4y$

Using the difference of squares identity, the expression can be factored as:

[ 25