(y-4)(y+4)

The expression \((y-4)(y+4)\) is a difference of squares. You can expand it using the formula \(a^2 - b^2 = (a-b)(a+b)\), where \(a = y\) and \(b = 4\).

So,

\[ (y-4)(y+4) = y^2 - 4^2 = y^2 - 16. \]

Thus, the expanded form of the expression is:

\[ y^2 - 16. \]