Question

Помогите пожалуйста я сделаю лудшим​

Answer 1

$1)(3a - 2b)(3a {}^{3} + 2b {}^{2} ) = 3a \times 3a {}^{3} + 3a \times 2b {}^{2} - 2b \times 3a {}^{3} - 2b \times 2b {}^{2} = 9a {}^{4} + 6ab {}^{2} - 6a {}^{3} b - 4b {}^{3}$

$2)3a {}^{2} + 7ab + 2b {}^{2} = 3a {}^{2} + 6ab + ab + 2b {}^{2} = 3a \times (a + 2b) + b \times (a + 2b) = (a + 2b) \times (3a + b)$