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উৎপাদকে বিশ্লেষণ কর: $(3a+1)^3-(2a-3)^3$

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$(3a+1)^3-(2a-3)^3$

$=\{(3a+1)-(2a-3)\}$$\{(3a+1)^2$$+(3a+1)(2a-3)$$+(2a-3)^2\}$

$=\{3a+1-2a+3\}$$[\{(3a)^2+2\cdot3a\cdot1+1^2\}$$+\{(2a-3)+1(2a-3)\}$$+\{(2a)^2-2\cdot2a\cdot3+3^2)\}]$

$=(a+4)$$(9a^2+6a+1$$+6a^2-9a+2a$$-3+4a^2$$-12a+9)$

$=(a+4)$$(19a^2-13a+7)$ [Answer]
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Rules Applied :

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

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