Correct Answer: Option D
প্রদত্ত রাশি = a³ + 1
= (a)³ + (1)³ [ ঘন-এর উৎপাদকের সূত্র: a³ + b³ = (a + b)(a² - ab + b²) ]
= (a + 1) (a² - a⋅1 + 1²)
= (a + 1) (a² - a + 1)
নির্ণেয় উৎপাদক: (a + 1)(a² - a + 1)
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