That's the easily recognizable factored form of the difference between two squares. Before factoring, it was
x² - 16 .
I think it is:
(x+4)(x-4) x(x-4)+4(x-4) x2-4x+4x-16 x2-16 ????????????
Multiplying ( x + 4 ) ( x − 4 ) using the difference of squares formula gives x 2 − 16 . This simplification is based on the standard formula ( a + b ) ( a − b ) = a 2 − b 2 . Therefore, the answer is x 2 − 16 .
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