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1. a 3 − 9 b 3 + ( a + b ) 3 এর একটি উৎপাদক (a-b) হলে অপরটি কত?

  • A. 2 a 2 − 5 a b − 8 b 2
  • B. 2 a 2 − 5 a b − 8 b 2
  • C. 2 a 2 − 5 a b − 8 b 2
  • D. 2 a 2 − 5 a b − 8 b 2

Answer: Option C

Explanation:

a3-b3+(a+b)3-(2b)3

(a-b)(a2+ab+b2)+(a+b-2b){(a+b)2 +(a+b)2b+(2b)2}

(a-b)(2a2+5ab+8b2)


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