Question

Помогите пж с первым заданием

Answer 1

Ответ:

1.

1)

$2 {x}^{3} (3x - 2) - 3x( {x}^{3} - 4 {x}^{2} + x) - x(8 + 3 {x}^{3} ) = \\ = 6 {x}^{4} - 4 {x}^{3} - 3 {x}^{4} + 12 {x}^{3} - 3 {x}^{2} - 8x - 3 {x}^{4} = \\ = 8 {x}^{3} - 3 {x}^{2} - 8x$

2)

$(5m - 2n)(3m + n) = 15 {m}^{2} + 5mn - 6mn - 2 {n}^{2} = \\ = 15 {m}^{2} - mn - 2 {n}^{2}$

3)

$(a - 3)( {a}^{2} + 4a + 2) = \\ = {a}^{3} + 4 {a}^{2} + 2a - 3 {a}^{2} - 12a - 6 = \\ = {a}^{3} + {a}^{2} - 10a - 6$