Sagot :
I think it is:
(x+4)(x-4)
x(x-4)+4(x-4)
x2-4x+4x-16
x2-16
????????????
(x+4)(x-4)
x(x-4)+4(x-4)
x2-4x+4x-16
x2-16
????????????
That's the easily recognizable factored form of
the difference between two squares. Before
factoring, it was
x² - 16 .
the difference between two squares. Before
factoring, it was
x² - 16 .