Question

 (a - b)^3 - (a^3 - b^3 ) = ? ​

Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

Answer:

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

Step-by-step explanation:

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