Solution
Correct Answer: Option D
মনে করি, ƒ(a) = a3 - a2 -10a - 8
∴ ƒ(-1) = (-1)3 - (-1)2 - 10(-1) - 8 = 0
∴ ভাগশেষ উপপাদ্য অনুসারে (a + 1), ƒ(a) এর একটি উৎপাদক
a3 - a2 -10a - 8
= a3 + a2 - 2a2 - 2a - 8a - 8
= a2(a + 1) - 2a(a + 1) - 8(a + 1)
= (a + 1)(a2 - 2a - 8)
= (a + 1) (a + 2)(a - 4)