Which one of the following is a factor of the expression
(a + b)³- (a – b)³ ?
(a) a
(b) 3a²- b
(c) 2b
(d)

1 thought on “Which one of the following is a factor of the expression<br />(a + b)³- (a – b)³ ?<br />(a) a<br />(b) 3a²- b<br />(c) 2b<br />(d)”

1. Answer:

   answer is option (a) a

   Step-by-step explanation:

   (a + b)³- (a – b)³

   = (a)³+ 3a²b+ 3ab²+( b)³ -(a)³+3a²b – 3ab²+( b)³

   = 2b³+ 6a²b

   = 2b(b²+ 3a²)

   answer is option (c) 2b

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