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ANSWER : 4
Descrption
<p>x² – x – (a + 1)(a + 2)<br>= x² – x – (a + 1)(a + 1 + 1)</p><p>মনে করি, a + 1 = y</p><p>তাহলে প্রদত্ত রাশি,<br>x² – x – y(y + 1)<br>= x² – x – y²– y<br>= x²– y² – x – y<br>= (x + y)(x – y) – 1(x + y)<br>= (x + y)(x – 1)</p><p>= (x + a + 1){x – (a +1 ) – 1} [y এর মান বসিয়ে]<br>= (x + a + 1)(x – a – 1 – 1)<br>= (x + a + 1)(x – a – 2) (ans.)</p>
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