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1. x2 - x - (a + 1) (a + 2) এর উৎপাদক কোনটি?
- A. (x - a + 1) (x - a - 2)
- B. (x - a + 1) (x - a - 2)
- C. (x - a + 1) (x - a - 2)
- D. (x - a + 1) (x - a - 2)
Answer: Option C
Explanation:
x² – x – (a + 1)(a + 2)
= x² – x – (a + 1)(a + 1 + 1)
মনে করি, a + 1 = y
তাহলে প্রদত্ত রাশি,
x² – x – y(y + 1)
= x² – x – y²– y
= x²– y² – x – y
= (x + y)(x – y) – 1(x + y)
= (x + y)(x – 1)
= (x + a + 1){x – (a +1 ) – 1} [y এর মান বসিয়ে]
= (x + a + 1)(x – a – 1 – 1)
= (x + a + 1)(x – a – 2) (ans.)
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