Do you mean '16x^(4) -1 ; or ' (16 X 4 ) - 1' . Reason , the answers will be different.
16x^(4) - 1 =
(2x)^(4) - 1^(4) =
((2x^(2) - 1^(2))((2x)^(2) + 1^(2)) =
(2x - 1)(2x +1)((2x)^(2) + 1^(2)) =
(2x - 1)(2x + 1)((2x)^(2) + 1) 2
&
( 16 X 4 ) - 1) = 64 - 1 = 63
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