sederhanakan aljabar berikut, tolong di bantu beserta caranya (x-y)³

Bab Eksponensial
Matematika SMP Kelas VIII

(x - y)³
= x³ - 3 . x² y + 3 . x y² - y³
= x³ - 3x²y + 3xy² - y³

(x-y)³ =
(x-y)(x-y)(x-y)=
(x²-xy-xy+y²)(x-y)=
(x²-2xy+y²)(x-y)=
x³-x²y-2x²y+2xy²+xy²-y³=
x³-y³-3x²y+3xy²