10. Factorise: (a + b)^3-a-b.
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Step-by-step explanation:
(a+b) ^3 -a-b
(a+b) ^3-(a+b) [taking - common]
(a+b) (a+b) ^2 -(a+b) (1)
(a+b) [(a+b) ^2-1]
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