Question

упростить выражение
(3х-х²)-х²(х-5)(х+5)+2х(8-3х²)

Answer 1

$3x - {x}^{2} - {x}^{2} \times ( {x}^{2} - 25) + 16x - 6 {x}^{3} = \\ 3x - {x}^{2} - {x}^{4} + 25 {x}^{2} + 16x - 16 {x}^{3} = \\ - {x}^{4} - 16 {x}^{3} + 24 {x}^{2} + 19x = - x( {x}^{3} + 16 {x}^{2} - 24x - 19)$
Думаю, так.