1) (x + y)(y - 5) = xy - 5x + y · y - 5y = xy - 5x + y² - 5y
2) (5 + 2)(-a - 2) = 7(-a - 2) = -7a - 14
3) (5y² + 1)(3y - 1) = 5y² · 3y - 5y² + 3y - 1 = 15y³ - 5y² + 3y - 1
4) (a² + b)(a - b²) = a² · a - a²b² + ab - b · b² = a³ - a²b² + ab - b³
5) c(2 + 3c)(5c - 1) = (2c + 3c²)(5c - 1) = 10c² - 2c + 15c³ - 3c² = 15c³ + 7c² - 2c
1) (x + y)(y - 5) = xy - 5x + y · y - 5y = xy - 5x + y² - 5y
2) (5 + 2)(-a - 2) = 7(-a - 2) = -7a - 14
3) (5y² + 1)(3y - 1) = 5y² · 3y - 5y² + 3y - 1 = 15y³ - 5y² + 3y - 1
4) (a² + b)(a - b²) = a² · a - a²b² + ab - b · b² = a³ - a²b² + ab - b³
5) c(2 + 3c)(5c - 1) = (2c + 3c²)(5c - 1) = 10c² - 2c + 15c³ - 3c² = 15c³ + 7c² - 2c