Answer:
a³ + b³
Explanation:
(a² - ab + b²)(a + b)
each term in the second factor is multiplied by each term in the first factor, that is
a²(a + b) - ab(a + b) + b²(a + b) ← distribute parenthesis
= a³ + a²b - a²b - ab² + ab² + b³ ← collect like terms
= a³ + b³