Question

Помогите пожалуйста! Срочно

Answer 1

$- 2zb {z}^{2} + {b}^{2} 2zb = 2z {b}^{3} - 2b {z}^{3} = 2zb( {b}^{2} - {z}^{2} ) = 2zb(b - z)(b + z) \ - - - - - - \ 2zb(b - z)(b + z) = 2 times frac{1}{2} times ( - 3)( - 3 - frac{1}{2} )( - 3 + frac{1}{2} ) = - 3 times ( - 3 frac{1}{2} )( - 2 frac{1}{2} ) = - 3 times ( - frac{7}{2} ) times ( - frac{5}{2} ) = - frac{3 times 7 times 5}{4} = - frac{105}{4} = - 26 frac{1}{4} = - 26.25$