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$a^3-b^3-8b^3+\left(a+b\right)^3$  উৎপাদকে বিশ্লেন কর।

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$a^3-b^3-8b^3+(a+b)^3$

$=a^3-b^3+(a+b)^3-(2b)^3$

$=(a-b)(a^2+ab+b^2)+$$\{(a+b)-2b\}$$\{(a+b)^2$$+(a+b)2b$$+(2b)^2\}$

$=(a-b)(a^2+ab+b^2)+$$(a+b-2b)$$(a^2+2ab+b^2$$+2ab+2b^2$$+4b^2)$

$=(a-b)(a^2+ab+b^2)+$$(a-b)$$(a^2+4ab+7b^2)$

$=(a-b)\{(a^2+ab+b^2)$$+(a^2+4ab$$+7b^2)\}$

$=(a-b)(a^2+ab+b^2$$+a^2+4ab$$+7b^2)$

$=(a-b)(2a^2+5ab+8b^2)$ [Answer]
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Rules Applied :

  • $a^3-b^3=(a-b)(a^2+ab+b^2)$
  • $(a+b)^2=a^2+2ab+b^2$

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