(x+4)(x-4)
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It can be factored. Whether the factored form is simpler or not is a matter of opinion.sqrt( 16 - x2 ) = sqrt [ (4 + x) (4 - x) ]
(x + 6z)(x - 6z)
64-x2 = (8-x)(8+x) when factored
x3 - x2 + 2x = x*(x2 - x + 2) which cannot be factored further.
(x - 3)(x - 2)