Question

Помогите пожалуйста срочно надо!

Answer 1

$- 2zb {z}^{2} + {b}^{2} 2zb = - 2zb( {z}^{2} - {b}^{2} ) = - 2zb(z - b)(z + b) = - frac{2 times ( - 3)}{2} times ( frac{1}{2} - ( - 3))( frac{1}{2} + ( - 3)) = 3 times 3 frac{1}{2} times ( - 2 frac{1}{2} ) = 3 times 3.5 times ( - 2.5) = - 26.25$