Jika x= 2a²b - 5ab dan y = 3a²b + ab Sederhanakan penjumlahaan dan pengurangan berikut A. 3x -y B. -x + 2y C. -2x - 4y Pakai cara yh ka mohon dikumpulin bsk

x = 2a²b - 5ab
y = 3a²b + ab

a)
3x - y
= 3 × (2a²b - 5ab) - (3a²b + ab)
= 6a²b - 15ab - 3a²b - ab
= 6a²b - 3a²b - 15ab - ab
= 3a²b - 16ab
= ab(3a - 16)

b)
-x + 2y
= -(2a²b - 5ab) + 2 × (3a²b + ab)
= -2a²b + 5ab + 6a²b + 2ab
= -2a²b + 6a²b + 5ab + 2ab
= 4a²b + 7ab
= ab(4a + 7)

c)
-2x - 4y
= -2 × (2a²b - 5ab) - 4 × (3a²b + ab)
= -4a²b + 10ab - 12a²b - 4ab
= -4a²b - 12a²b + 10ab - 4ab
= -16a²b + 6ab
= -2ab(8a - 3)