Question

Помогите пожалуйста

Answer 1

$28 - 7 {x}^{5} - 12 {x}^{2} + 3 {x}^{7} = \\ 7(4 - {x}^{5} ) - 3 {x}^{2} (4 - {x}^{5} ) = \\ (4 - {x}^{5} )(7 - 3 {x}^{2} )$
zx-7z-112d+16xd=z(x-7)-16d(7-x)=z(x-7)+16d(x-7)=
(x-7)(z+16d)