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= 2a (3a² - 6a + 9) + 3(3a² - 6a + 9)
= 6a³ - 12a² + 18a + 9a³ - 18a + 27
= 6a³ + 9a³ - 12a² + 18a - 18a + 27
= 15a³ - 12a² + 27
b. (5p - 4q) (25p² + 20pq + 16q²)
= 5p(25p² + 20pq + 16q²) - 4q(25p² + 20pq + 16p²)
= 125p³ + 100p²q + 80pq² - 100p²q - 80pq² - 64p²q
= 125p³ + 100p²q - 100p²q + 80pq² - 80pq² - 64p²q
= 125p³ - 64p²q
Semoga ngebantu ya... :)