Math, asked by shreyashukla81, 3 months ago

factorise using appropriate identities 125x^3 + 8y^3​

Answers

Answered by Anonymous
25

Given:-

factorise using appropriate identities 125x^3 + 8y^3

Analysis

here we use the identity:  \blue { \underline{ \boxed{  \sf{ \purple{a3 – b3 = (a – b) (a2 + ab + b2}}}}}

Solution:-

➺now,125= a

➺8=b

  \sf \: : ⟹ a3 – b3 = (a – b) (a2 + ab + b2 ).  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \: \\  \\ \sf : ⟹ {125}^{3}  -  {8}^{3}  = \: (125 - 8)( {125}^{2}   + (125 \times 8) +  {8}^{2} ) \\  \\ \sf : ⟹ {125}^{3}  -  {8}^{3}   = 117(15625 + 1000 + 64 \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \\ \\   \sf: ⟹ \:  {125}^{3}  -  {8}^{3} = 117(16689) \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \\  \\  \sf: ⟹ {125}^{3}  -  {8}^{3}   = 1952613 \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \: \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:

hope this helps.!!

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