(x + 1)3 + (x - 1)3 is equal to
(1) 2x(x2 + 3)
(2) (x2 + 3)
(3) (x2 + 2x + 1)
(4) (x + 1)(x2 + 3)
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ANSWER = (1) 2x( x² + 3)
(x+1)³ + (x-1)³ = x³ + 3x² + 3x + 1 + x³ - 3x² + 3x - 1
= 2x³ +6x
= 2x( x² + 3 )
NB :- Please consider writing question properly Next time
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