0
(2x + 4)(2x - 4)
to check your answer, use the FOIL method
(first, outside, inside, last)
F.... 2x x 2x = 4x^2
0.... 2x x -4 = -8x
I..... 2x x 4 = 8x
L.... 4 x -4 = -16
so 4x^2 - 16 = (2x + 4)(2x - 4)
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