It is the difference of squares. (x-4) and (x+4) <--- answer
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(x + 1)(x - 8)
(x - 2)(2x + 3)
The factoring is as follows: x2 - y2 = (x + y) * (x - y)
x^2 - y^2 - 4 is in its simplest form.
2x squared - 5x - 3 = (2x +1)(x -3)