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

x2 - 16 is the difference of two squares:

a2 - b2 factorises as (a + b)(a -b), thus:

x2 - 16 = x2 - 42

= (x + 4)(x - 4)

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Q: How do you factor completely x squared minus 16?
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