Question

Упростите вырожение пожалуйста помогите​

Answer 1

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