Question

Multiply, (x+4)(x-4)  simplify answer.

Answer 1

I think it is:

(x+4)(x-4)
x(x-4)+4(x-4)
x2-4x+4x-16
x2-16
????????????

Answer 2

That's the easily recognizable factored form of
the difference between two squares. Before
factoring, it was

x² - 16 .