Question

1. (2x + 3) (x - 4)
2. (a + ab + b ) (a - b)

Answer 1

1. (2x + 3)(x - 4)
=> 2x² - 8x + 3x - 12
=> 2x² - 5x - 12
2. (a + ab + b)(a - b)
=> a² - ab + a²b - ab² + ab - b²
=> a² + a²b - ab² - b² (Sudah selesai sampai sini)
=> (a² - b²) + ab(a - b)