Verified answer

Verified answer

1) 5b · (3a - b) - 3a · (5b + a) =  15ab - 5b² - 15ab - 3a² = -3a² - 5b²

2) a · (2a² - 3n) - n · (2n² + a) = 2a³ - 3an - 2n³ - an = 2a³ - 4an - 2n³