y=(x-4)(x+4)

The expression \( y = (x - 4)(x + 4) \) can be simplified using the difference of squares formula, which states that \( (a - b)(a + b) = a^2 - b^2 \).

In this case, \( a = x \) and \( b = 4 \). Applying the formula gives:

\[ y = x^2 - 4^2 \] \[ y = x^2 - 16 \]

So, the simplified form of the expression is:

\[ y = x^2 - 16 \]

If you need further analysis or specific information about this function, such as its graph, intercepts, or other properties, feel free to ask!