(a+2)(a²-2a+2²)

a(a²-2a+2²)+2(a²-2a+2²)

х³-2х²+2²х+2х²-4х+2³

х³+4х-4х+2³

х³+2³

х³+8

(a+2)×(a² - 2a + 2²)

a × (a² - 2a + 2²) + 2(a² - 2a + 2²)

a³ - 2a² + 2²a + 2a² - 4a + 2³

a³ + 4a - 4a + 2³

a³ + 8